philanderer vs libertine

philanderer and libertine both are nouns.

Word	Noun	Adjective	Verb	Adverb
philanderer	Yes	No	No	No
libertine	Yes	Yes	No	No

As nouns, libertine is a hypernym of philanderer; that is, libertine is a word with a broader meaning than philanderer:

philanderer: a man who likes many women and has short sexual relationships with them
libertine: a dissolute person; usually a man who is morally unrestrained

Other hypernyms of philanderer include debauchee, rounder, adult male, man.

philanderer (noun)	libertine (noun)
a man who likes many women and has short sexual relationships with them	a dissolute person; usually a man who is morally unrestrained

philanderer (adjective)	libertine (adjective)
	unrestrained by convention or morality