kept man vs woman

kept man and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
kept man	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of kept man; that is, woman is a word with a broader meaning than kept man:

kept man: an adulterous man; a man who has an ongoing extramarital sexual relationship with a woman
woman: an adult female person (as opposed to a man)

Other hypernyms of kept man include adult female.

kept man (noun)	woman (noun)
an adulterous man; a man who has an ongoing extramarital sexual relationship with a woman	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man