'young man' definitions:

Definition of 'young man'

(from WordNet)
noun
A teenager or a young adult male [syn: young buck, young man]
noun
A man who is the lover of a girl or young woman; "if I'd known he was her boyfriend I wouldn't have asked" [syn: boyfriend, fellow, beau, swain, young man]

Synonyms of 'young man'

From: Moby Thesaurus