slut vs adult female

slut and adult female both are nouns.

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

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

Other hypernyms of slut include adulterer, fornicator, woman.

slut (noun)	adult female (noun)
a woman adulterer	an adult female person (as opposed to a man)
a dirty untidy woman
A sexually loose woman