productive vs productivity

productive is not a noun while productivity is a noun.

Word	Noun	Adjective	Verb	Adverb
productive	No	Yes	No	No
productivity	Yes	No	No	No

productive (noun)	productivity (noun)
	the quality of being productive or having the power to produce
	(economics) the ratio of the quantity and quality of units produced to the labor per unit of time

productive (adjective)	productivity (adjective)
producing or capable of producing (especially abundantly)
having the ability to produce or originate
marked by great fruitfulness
yielding positive results