philanderer vs womanizer

philanderer and womanizer both are nouns.

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

As nouns, philanderer and womanizer are synonyms defined as:

philanderer and womanizer: a man who likes many women and has short sexual relationships with them

Other synonyms of philanderer include womaniser.

philanderer (noun)	womanizer (noun)
a man who likes many women and has short sexual relationships with them	a man who likes many women and has short sexual relationships with them