mistress vs woman

mistress and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
mistress	Yes	No	No	No
woman	Yes	No	No	No

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

Other hypernyms of mistress include employer, adult female.

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

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

Other hypernyms of mistress include lover, adult female.

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

Other hypernyms of mistress include school teacher, schoolteacher, adult female.

mistress (noun)	woman (noun)
a woman master who directs the work of others	women as a class
an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man	an adult female person (as opposed to a man)
a woman schoolteacher (especially one regarded as strict)	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man