womanizer vs adult male

womanizer and adult male both are nouns.

Word	Noun	Adjective	Verb	Adverb
womanizer	Yes	No	No	No
adult male	Yes	No	No	No

As nouns, adult male is a hypernym of womanizer; that is, adult male is a word with a broader meaning than womanizer:

womanizer: a man who likes many women and has short sexual relationships with them
adult male: an adult person who is male (as opposed to a woman)

Other hypernyms of womanizer include debauchee, libertine, rounder, man.

womanizer (noun)	adult male (noun)
a man who likes many women and has short sexual relationships with them	an adult person who is male (as opposed to a woman)