In the sentence, "Where is the cat?", what part of speech is the word "where"?
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2Frankly, I think no one knows. You can argue it's an adverb, you can argue that it's a conjunction, you can argue that it's a noun. – Hot Licks Feb 3 '17 at 4:15
Wikipedia uses interrogative word or simply question-word. This word class is not contained in the traditional list of word classes. https://en.m.wikipedia.org/wiki/Interrogative_word
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@H3br3wHamm3r81: or maybe more of an "interrogative pro-prepositional phrase". Relevant: Is “now” a “preposition”? – herisson Feb 3 '17 at 4:22