shiksa vs adult female

shiksa and adult female both are nouns.

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

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

Other hypernyms of shiksa include woman.

shiksa (noun)	adult female (noun)
a derogatory term used by Jews to refer to non-Jewish women	an adult female person (as opposed to a man)