committeewoman vs adult female

committeewoman and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
committeewoman	Yes	No	No	No
adult female	Yes	No	No	No

As nouns, adult female is a hypernym of committeewoman; that is, adult female is a word with a broader meaning than committeewoman:

Other hypernyms of committeewoman include committee member, woman.

committeewoman (noun)	adult female (noun)
a woman who is a member of a committee	an adult female person (as opposed to a man)