cover girl vs woman

cover girl and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
cover girl	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of cover girl; that is, woman is a word with a broader meaning than cover girl:

Other hypernyms of cover girl include photographer's model, adult female.

cover girl (noun)	woman (noun)
a very pretty girl who works as a photographer's model	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man