philanderer vs womaniser

philanderer and womaniser both are nouns.

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

As nouns, philanderer and womaniser are synonyms defined as:

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

Other synonyms of philanderer include womanizer.

philanderer (noun)	womaniser (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