Wac vs adult female

Wac and adult female both are nouns.

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

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

Other hypernyms of Wac include soldier, woman.

Wac (noun)	adult female (noun)
a member of the Women's Army Corps	an adult female person (as opposed to a man)