productiveness vs productive

productiveness is a noun but productive is not a noun.

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

productiveness (noun)	productive (noun)
the quality of being productive or having the power to produce

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