fecundity vs fertility

fecundity and fertility both are nouns.

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

As nouns, fertility is a hyponym of fecundity; that is, fertility is a word with a more specific, narrower meaning than fecundity:

fecundity: the quality of something that causes or assists healthy growth
fertility: the property of producing abundantly and sustaining vigorous and luxuriant growth

Other hyponyms of fecundity include prolificacy, rankness, richness, productiveness, productivity.

As nouns, fecundity and fertility are synonyms defined as:

fecundity and fertility: the state of being fertile; capable of producing offspring

fecundity (noun)	fertility (noun)
the quality of something that causes or assists healthy growth	the property of producing abundantly and sustaining vigorous and luxuriant growth
the intellectual productivity of a creative imagination	the state of being fertile; capable of producing offspring
the state of being fertile; capable of producing offspring	the ratio of live births in an area to the population of that area; expressed per 1000 population per year