"Whereabout" is a word that can be used as an adverb or a noun to ask about or refer to the location of a person or thing. As an adverb, it means "near what place" or "about where," while as a noun, it refers to the general location itself. For example, "Whereabouts do you live?" is an adverbial use, while "I don't know his whereabouts" is a noun use.