clanswoman vs adult female

clanswoman and adult female both are nouns.

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

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

Other hypernyms of clanswoman include clan member, woman.

clanswoman (noun)	adult female (noun)
a female member of a clan	an adult female person (as opposed to a man)