unfertile vs fecundity

unfertile is not a noun while fecundity is a noun.

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

unfertile (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

unfertile (adjective)	fecundity (adjective)
incapable of reproducing