married woman vs woman

married woman and woman both are nouns.

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

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

Other hypernyms of married woman include better half, married person, mate, partner, spouse, adult female.

married woman (noun)	woman (noun)
a married woman; a man's partner in marriage	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