If you have ever paused while writing or speaking and wondered, what part of speech is who, you are asking one of the most common questions in English grammar. Unlike a noun that simply names a person, who steps in to replace a noun, ask about a person, or connect ideas about a person. The short answer is that who is a pronoun, but its job changes depending on where it appears in a sentence. Understanding this small word unlocks clearer sentence structure, better punctuation, and more confident communication.
What Part of Speech Is Who? The Short Answer
In traditional English grammar, there are eight main parts of speech: noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection. Who belongs to the pronoun category. A pronoun is a word that takes the place of a noun or noun phrase so you do not have to repeat the same name over and over.
What makes who special is that it does not just replace any noun. So it refers specifically to people. When you say, The teacher who assigned the project is kind, the word who stands in for the teacher and connects additional information about that person. Because it points to a person rather than naming one directly, it functions as a pronoun rather than a noun Not complicated — just consistent..
Who as an Interrogative Pronoun
One of the most frequent roles of who is as an interrogative pronoun. Interrogative pronouns are used to ask questions, and who is the one we use when we want to know something about a person That's the part that actually makes a difference..
Examples of Who in Questions
- Who is at the door?
- Who called you this morning?
- Who wants to go first?
- Who wrote this book?
In each of these sentences, who stands in for the unknown person. The speaker does not yet know the name or identity, so who acts as a placeholder until the answer is provided. It usually appears at the beginning of the question, though it can also appear in the middle in more complex sentence structures.
Most guides skip this. Don't.
Something to flag here that who can function as either the subject or the object of a question, even though formal grammar reserves whom for objects. In everyday English, most people use who for both roles: *Who did you invite?In real terms, * is standard in casual conversation, even though *Whom did you invite? * is the traditional formal choice.
Who as a Relative Pronoun
Beyond asking questions, who also works as a relative pronoun. Relative pronouns introduce relative clauses—groups of words that describe a noun without starting a brand-new sentence. When who is used this way, it
