prolificacy vs fertility

prolificacy and fertility both are nouns.

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

As nouns, prolificacy and fertility are synonyms defined as:

prolificacy and fertility: the property of producing abundantly and sustaining vigorous and luxuriant growth

Other synonyms of prolificacy include rankness, richness.

prolificacy (noun)	fertility (noun)
the property of producing abundantly and sustaining vigorous and luxuriant growth	the property of producing abundantly and sustaining vigorous and luxuriant growth
	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