councilwoman vs council member

councilwoman and council member both are nouns.

Word	Noun	Adjective	Verb	Adverb
councilwoman	Yes	No	No	No
council member	Yes	No	No	No

As nouns, council member is a hypernym of councilwoman; that is, council member is a word with a broader meaning than councilwoman:

Other hypernyms of councilwoman include councillor, adult female, woman.

councilwoman (noun)	council member (noun)
a woman who is a council member	a member of a council