infertile vs fecundity

infertile is not a noun while fecundity is a noun.

Word	Noun	Adjective	Verb	Adverb
infertile	No	Yes	No	No
fecundity	Yes	No	No	No

infertile (noun)	fecundity (noun)
	the quality of something that causes or assists healthy growth
	the intellectual productivity of a creative imagination
	the state of being fertile; capable of producing offspring

infertile (adjective)	fecundity (adjective)
incapable of reproducing