Scotswoman vs adult female

Scotswoman and adult female both are nouns.

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

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

Other hypernyms of Scotswoman include Scot, woman.

Scotswoman (noun)	adult female (noun)
a woman who is a Scot	an adult female person (as opposed to a man)