Definitions
1.AdverbIn, at or near what location."Whereabouts do you live?"
2.NounA location; where something is situated.
3.NounInformation about an elite athlete's future whereabouts, supplied to antidoping authorities to facilitate random out-of-competition testing.
4.Noun↑ Merriam-Webster's Dictionary of English Usage (1989), p. 955; Fowler's Dictionary of Modern English Usage (4th ed., 2015) p.880, Garner's Modern English Usage (4th ed., 2018) p.960
5.Noun↑ UPI Style Book & Guide to Newswriting (4th ed., 2004) p. 264; The Wall Street Journal Guide to Business Style and Us (2010) p. 249
6.Noun↑ The Economist Style Guide (12th ed., 2018) sv "plural nouns"