What part of speech is where's?

Answer 1

Where can be a conjunction, an adverb, a pronoun and a noun.

Answer 2

where's is actually where is. i don't know what part of speech "where" is, but "is" is a being verb. In the sentence, "Where is your cat?" "where" is an adverb. You can change the question into a declarative sentence and it would be "Your cat is where." It doesn't make much sense but "where" tells where your cat is.

Answer 3

Where can be a conjunction, an adverb, a pronoun and a noun.