“Which” is a function word that asks about choices (“Which one do you want?”) or connects clauses to a noun (“the book, which I loved”). Because these are distinct grammatical jobs rather than one single meaning, this guide separates them clearly, offering 55 accurate alternatives and related phrases grouped by function rather than treating “which” as a word with ordinary synonyms.
Important: because “which” is a function word (a pronoun and determiner) rather than a content word with a clear meaning, this list won’t reach “70 exact synonyms” for one sense — instead it offers 55 accurate alternatives and related phrasings across its main grammatical roles, each labeled by how it’s actually used.
Best Alternatives for Which at a Glance
| Word/Phrase | Best Used For | Function |
|---|---|---|
| What | Asking about an open-ended set of options | Interrogative |
| That | Introducing a restrictive relative clause | Relative Pronoun |
| Who | Asking about or referring to a person | Interrogative/Relative |
| Whichever | Indicating any one of several options, without preference | Indefinite Relative |
| What kind of | Asking about a category or type | Interrogative Phrase |
What Does Which Mean?
1. Asking someone to choose among a limited set of options: Example: “Which restaurant do you prefer?”
2. Introducing a clause that adds information about a noun already mentioned: Example: “The car, which was parked outside, had a flat tire.”
3. Introducing a restrictive clause that identifies a specific thing: Example: “Choose the option which best fits your needs.”
4. Referring back to an entire previous clause or idea: Example: “She apologized, which surprised everyone.”
Origin and Etymology of Which
“Which” comes from the Old English hwilc, meaning “of what kind” or “which one,” itself derived from a Proto-Germanic compound roughly meaning “who-like.” Its earliest use asked about identity or kind among a group, and it has kept that core function through Middle English into the modern language, splitting over time into its interrogative and relative pronoun roles.
Connotation and Tone of Which
“Which” is entirely neutral and grammatical, carrying no emotional weight in either its interrogative or relative use. Formal writing tends to prefer “which” over “that” for non-restrictive clauses set off by commas, while “that” is generally preferred for restrictive clauses in both formal and informal writing.
Alternatives for Which by Function
Asking About a Choice Among Options (Interrogative)
What, What one, Who (for people), What kind of, What sort of — these ask the listener to select among a set of possibilities.
Introducing a Clause About a Noun (Relative Pronoun, Non-Restrictive)
That (informally, though traditionally reserved for restrictive clauses), Who (for people) — these add extra, non-essential information about a noun already mentioned.
Introducing a Clause That Identifies a Thing (Relative Pronoun, Restrictive)
That, Who (for people) — these introduce essential information that identifies exactly which thing is meant.
Referring to an Entire Preceding Idea
A fact that, A situation that, Something that — these substitute for “which” when it refers back to a whole clause rather than a single noun.
Indicating Any One Option Without Preference
Whichever, Whatever, Any one that — these indicate that the specific choice among options doesn’t matter.
55 Alternatives and Related Phrases for Which
1. What
Part of Speech: Interrogative pronoun
Meaning: Asks for information from an open, often unspecified set
Best Used For: Open-ended questions without a limited set of options
Example: “What do you want for dinner?”
Nuance: “Which” implies a limited, known set of choices; “what” implies an open set
Synonym Strength: Contextual (interrogative sense)
2. That
Part of Speech: Relative pronoun
Meaning: Introduces a clause that identifies or restricts the noun it follows
Best Used For: Restrictive clauses, especially in everyday and American English
Example: “This is the book that changed my life.”
Nuance: Traditionally reserved for restrictive (essential) clauses, unlike non-restrictive “which”
Synonym Strength: Close (relative pronoun, restrictive sense)
3. Who
Part of Speech: Relative/interrogative pronoun
Meaning: Refers to or asks about a person rather than a thing
Best Used For: Any context where the referent is a person, not a thing
Example: “Who left this note?” / “The woman who called earlier is here.”
Nuance: Used specifically for people, where “which” would normally be reserved for things
Synonym Strength: Contextual (person-referring sense)
4. Whichever
Part of Speech: Indefinite relative pronoun
Meaning: Any one of a set, without a specific preference
Best Used For: Indicating indifference among a set of choices
Example: “Take whichever seat you like.”
Nuance: Broadens “which” to mean “no matter which one”
Synonym Strength: Close (indefinite sense)
5. What kind of
Part of Speech: Interrogative phrase
Meaning: Asks about the category or type of something
Best Used For: Questions about type rather than a specific known set
Example: “What kind of music do you like?”
Nuance: Focuses on category rather than choosing among named options
Synonym Strength: Contextual (interrogative sense)
6. What sort of
Part of Speech: Interrogative phrase
Meaning: Asks about the type or nature of something
Best Used For: Slightly more British-flavored version of “what kind of”
Example: “What sort of car are you looking for?”
Nuance: Functionally identical to “what kind of,” slightly more formal in tone
Synonym Strength: Contextual (interrogative sense)
7. What one
Part of Speech: Interrogative phrase
Meaning: Asks someone to select a specific item from a set
Best Used For: Casual speech, especially when pointing at options
Example: “What one do you want, the red or the blue?”
Nuance: Very casual, often used interchangeably with “which one” in speech
Synonym Strength: Close (interrogative sense, informal)
8. A fact that
Part of Speech: Noun phrase
Meaning: Introduces a fact referring back to a previous clause
Best Used For: Replacing “which” when it refers to an entire preceding idea
Example: “He forgot the tickets, a fact that annoyed everyone.”
Nuance: More explicit than “which” about referring to the whole preceding clause
Synonym Strength: Contextual (clause-referring sense)
9. A situation that
Part of Speech: Noun phrase
Meaning: Introduces a description of circumstances referring to a prior clause
Best Used For: Formal writing referring back to a described situation
Example: “Costs rose sharply, a situation that forced layoffs.”
Nuance: More formal and explicit than a bare “which”
Synonym Strength: Contextual (clause-referring sense)
10. Something that
Part of Speech: Noun phrase
Meaning: A vague reference back to a previously mentioned idea
Best Used For: Casual speech referring to a preceding statement
Example: “She got the promotion, something that surprised no one.”
Nuance: Casual and vague compared to formal alternatives
Synonym Strength: Contextual (clause-referring sense, informal)
11. Whatever
Part of Speech: Indefinite relative pronoun
Meaning: Any thing at all, without restriction
Best Used For: Broad indifference among an open, unnamed set of options
Example: “Order whatever you like.”
Nuance: Broader than “whichever,” which implies a known, limited set
Synonym Strength: Contextual (indefinite sense)
12. Any one that
Part of Speech: Phrase
Meaning: Refers to any single item from a group, without preference
Best Used For: Explicit indifference among a known set
Example: “You can pick any one that fits your budget.”
Nuance: More explicit and wordy than “whichever”
Synonym Strength: Contextual (indefinite sense)
13. Whichsoever (archaic/formal)
Part of Speech: Indefinite relative pronoun
Meaning: An emphatic, archaic form of “whichever”
Best Used For: Legal, formal, or archaic writing
Example: “Whichsoever path you choose, proceed with care.”
Nuance: Rare, formal, and slightly old-fashioned
Synonym Strength: Contextual (indefinite sense, formal)
14. What number
Part of Speech: Interrogative phrase
Meaning: Asks for a specific numbered item from a set
Best Used For: Questions about numbered options, such as a list
Example: “What number bus goes downtown?”
Nuance: Specific to numbered items, unlike general “which”
Synonym Strength: Contextual (interrogative sense, narrow use)
15. Who or what
Part of Speech: Interrogative phrase
Meaning: Asks broadly about either a person or thing
Best Used For: Questions where the referent’s category is uncertain
Example: “Who or what caused the delay?”
Nuance: Combines both interrogative pronouns for broader questions
Synonym Strength: Contextual (interrogative sense)
16. This (as a relative substitute)
Part of Speech: Demonstrative pronoun
Meaning: Points to a specific, nearby item or idea already mentioned
Best Used For: Starting a new sentence referring back to a prior idea
Example: “He canceled the meeting. This upset the whole team.”
Nuance: Requires splitting into two sentences rather than one clause
Synonym Strength: Contextual (clause-referring sense)
17. Whereupon (formal)
Part of Speech: Conjunctive adverb
Meaning: Immediately after which; following which
Best Used For: Formal or literary writing describing a sequence of events
Example: “The alarm sounded, whereupon everyone evacuated.”
Nuance: Formal and slightly old-fashioned, implies immediate sequence
Synonym Strength: Contextual (clause-referring sense, formal)
18. As a result of which (formal)
Part of Speech: Phrase
Meaning: Introduces a consequence stemming from a previous clause
Best Used For: Formal writing emphasizing cause and effect
Example: “Funding was cut, as a result of which the program ended.”
Nuance: More explicit about causation than a bare “which”
Synonym Strength: Contextual (clause-referring sense, formal)
19. That particular
Part of Speech: Determiner phrase
Meaning: Specifies one exact item among several
Best Used For: Emphasizing a specific, singled-out choice
Example: “I want that particular shade of blue, not the others.”
Nuance: Adds emphasis on precision and specificity
Synonym Strength: Contextual (selection sense)
20. The one that
Part of Speech: Phrase
Meaning: Identifies a specific single item from a set
Best Used For: Casual speech identifying a specific choice
Example: “I’ll take the one that’s on sale.”
Nuance: Common, casual way to identify a single selection
Synonym Strength: Close (selection sense, informal)
21-55. More Alternatives and Related Phrases for Which
| Word/Phrase | Meaning/Nuance | Function |
|---|---|---|
| 21. What kind | Shortened, casual form of “what kind of” | Interrogative |
| 22. What type of | Asks about category, similar to “what kind of” | Interrogative |
| 23. Who among | Asks which person among a group | Interrogative |
| 24. What among | Formal phrase asking which item among a group | Interrogative |
| 25. Any of | Casual phrase asking about a subset of options | Interrogative |
| 26. Whichever one | Emphatic form of “whichever” for a single item | Indefinite Relative |
| 27. No matter which | Emphasizes indifference among named options | Indefinite Relative |
| 28. Regardless of which | Formal phrase for indifference among options | Indefinite Relative |
| 29. Such that | Introduces a resulting clause (different structure) | Clause-Referring |
| 30. In which case | Refers back to a stated condition or scenario | Clause-Referring |
| 31. At which point | Refers to a moment in a described sequence | Clause-Referring |
| 32. After which | Refers to what follows a described event | Clause-Referring |
| 33. During which | Refers to the timeframe of a described event | Clause-Referring |
| 34. For which | Refers to a purpose or reason tied to a prior clause | Clause-Referring |
| 35. By which | Refers to a means tied to a prior clause | Clause-Referring |
| 36. Through which | Refers to a channel or process tied to a prior clause | Clause-Referring |
| 37. Of which | Refers to a possessive relationship to a prior noun | Clause-Referring |
| 38. To which | Refers to a destination or recipient tied to a prior clause | Clause-Referring |
| 39. From which | Refers to an origin tied to a prior clause | Clause-Referring |
| 40. Whereby (formal) | Formal term meaning “by which” or “through which” | Clause-Referring |
| 41. That specific | Emphasizes a single, exact item | Selection |
| 42. The exact one | Casual phrase emphasizing precision in selection | Selection |
| 43. The particular | Formal phrase emphasizing a singled-out item | Selection |
| 44. Such as | Introduces an example rather than identifying a clause | Related, Not Exact |
| 45. What exactly | Emphatic interrogative asking for precision | Interrogative |
| 46. Precisely what | Formal, emphatic interrogative phrase | Interrogative |
| 47. What specifically | Emphatic interrogative asking for detail | Interrogative |
| 48. Who exactly | Emphatic interrogative for a person | Interrogative |
| 49. What ones | Casual plural form asking about multiple choices | Interrogative |
| 50. Which ones (repeat use) | Standard plural interrogative form of “which” | Interrogative |
| 51. Any that | Casual phrase indicating an unspecified selection | Selection |
| 52. Every one that | Refers to all items meeting a condition | Selection |
| 53. That certain | Casual phrase emphasizing a specific, singled-out item | Selection |
| 54. Choose from | Verb phrase implying selection among named options | Related, Not Exact |
| 55. Pick between | Casual verb phrase implying a choice between two options | Related, Not Exact |
Closest, Contextual, and Related Alternatives
| Category | Examples | Notes |
|---|---|---|
| Closest (interrogative) | What, What one, What kind of | Can replace “which” when asking about options |
| Closest (relative, things) | That, Whereby, Of which | Can replace “which” in relative clauses about things |
| Related (relative, people) | Who, Whom | Replace “which” only when the referent is a person |
Formal and Informal Alternatives
| Formal | Informal |
|---|---|
| Whereby | What one |
| As a result of which | Something that |
| Whichsoever | Any of |
| Of which | Any that |
Which vs Similar Words
Which vs What
“Which” implies choosing from a known, limited set, while “what” is more open-ended and doesn’t assume a specific set of options exists.
Which vs That
In relative clauses, “which” traditionally introduces non-restrictive (extra) information set off by commas, while “that” introduces restrictive (essential) information without commas.
Which vs Who
“Which” refers to things, animals without names, or categories, while “who” is reserved specifically for people (and sometimes named animals).
Which vs Whichever
“Which” asks about or identifies a specific option, while “whichever” indicates that the specific choice among the options doesn’t matter.
Words Related But Not Exact Synonyms
- Choose — the action of selecting among options, not the word asking about them
- Option — one of the choices “which” asks about, not “which” itself
- Decide — the act of settling on one option, distinct from “which”
- Either — implies exactly two options, unlike the open-ended “which”
- Various — describes multiple items generally, without asking a question
Words Related to Which
Choice, Option, Selection, Alternative, Comparison, Identification
Common Collocations With Which
Which one, which way, which is why, in which case, at which point, which means, which reminds me, which brings us to, tell me which, which of these
Opposite Relationships to Which
| Word/Phrase | Meaning |
|---|---|
| All | Refers to every item rather than asking about one specific choice |
| None | Rejects every option rather than selecting one |
| Whatever (dismissive sense) | Indicates a total lack of preference, unlike a specific “which” |
| Either/or | Presents a binary choice, narrower than the open-ended “which” |
How to Choose the Right Alternative for Which
First, identify which job “which” is doing in your sentence: asking about a choice, introducing information about a thing, or referring to a whole prior idea. For questions, “what” works when the options aren’t a known, limited set, while “which” (or “what one” casually) works when they are. For relative clauses about things, “that” suits restrictive clauses, while “which” suits non-restrictive ones set off by commas. For people, always switch to “who” instead of “which.”
Common Mistakes When Using Which Alternatives
A common mistake is using “which” for restrictive clauses in formal writing, where “that” is traditionally preferred (“the book that I read” rather than “the book which I read” in strict style guides, though both are common in practice). Another is using “which” to refer to a person instead of “who” (“the man which called” is incorrect; “the man who called” is correct). Writers should also avoid confusing “whichever” (a specific, known set) with “whatever” (a broader, open set) when expressing indifference among options.
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Frequently Asked Questions
What is the most common formal alternative for which in a relative clause?
“That” is the most common formal alternative when the clause is restrictive (essential to identifying the noun).
Can which be used to refer to a person?
No — “which” refers to things or categories; “who” is used specifically for people.
What’s the difference between which and what as questions?
“Which” implies choosing among a known, limited set of options, while “what” is more open-ended.
What’s a casual way to say which one?
“What one” works as a casual, conversational equivalent to “which one.”
What’s a formal phrase for “which caused”?
“As a result of which” and “whereby” both work as formal alternatives.
What’s the opposite of asking “which”?
Statements using “all” or “none” reject the idea of choosing a single option, functioning as the opposite of a “which” question.
Conclusion
“Which” quietly handles several different grammatical jobs — asking about a choice, introducing information about a thing, and referring back to a whole idea — so choosing the right alternative starts with identifying which job it’s doing in your sentence. With 55 accurate alternatives and related phrasings split across these functions, you can replace “which” precisely rather than treating this small but versatile word as having ordinary synonyms.
