congresswoman vs woman

congresswoman and woman both are nouns.

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

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

congresswoman: a female member of the United States House of Representatives
woman: an adult female person (as opposed to a man)

Other hypernyms of congresswoman include representative, adult female.

congresswoman (noun)	woman (noun)
a female member of the United States House of Representatives	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