female reproductive system vs ovary

female reproductive system and ovary both are nouns.

Word	Noun	Adjective	Verb	Adverb
female reproductive system	Yes	No	No	No
ovary	Yes	No	No	No

female reproductive system (noun)	ovary (noun)
the reproductive system of females	(vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone
	the organ that bears the ovules of a flower