newswoman vs adult female

newswoman and adult female both are nouns.

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

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

Other hypernyms of newswoman include newsperson, reporter, woman.

newswoman (noun)	adult female (noun)
a female newsperson	an adult female person (as opposed to a man)