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It depends on how it is used in the sentence. It can be:

an adverb (Do you know when he will come home?) - modifies the verb "come"

a conjunction (Why would I go to the movies when I can stay home and watch a rental?) - connects two independent clauses

In rare cases it can be used as a noun or a pronoun as well.

However, you don't need answers.com to figure this out - it can be found in virtually any English dictionary ever published. Go to the library and look it up. It will be under the "W" section.

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15y ago

What else can I help you with?