ovary vs gonad

ovary and gonad both are nouns.

Word	Noun	Adjective	Verb	Adverb
ovary	Yes	No	No	No
gonad	Yes	No	No	No

As nouns, gonad is a hypernym of ovary; that is, gonad is a word with a broader meaning than ovary:

ovary: (vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone
gonad: a gland in which gametes (sex cells) are produced

Other hypernyms of ovary include female internal reproductive organ, sex gland.

ovary (noun)	gonad (noun)
(vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone	a gland in which gametes (sex cells) are produced
the organ that bears the ovules of a flower