pin-up vs cover girl

pin-up and cover girl both are nouns.

Word	Noun	Adjective	Verb	Adverb
pin-up	Yes	No	No	No
cover girl	Yes	No	No	No

As nouns, pin-up and cover girl are synonyms defined as:

pin-up and cover girl: a very pretty girl who works as a photographer's model

Other synonyms of pin-up include lovely.

pin-up (noun)	cover girl (noun)
a very pretty girl who works as a photographer's model	a very pretty girl who works as a photographer's model