proportionate vs proportionateness

proportionate is not a noun while proportionateness is a noun.

Word	Noun	Adjective	Verb	Adverb
proportionate	No	Yes	No	No
proportionateness	Yes	No	No	No

proportionate (noun)	proportionateness (noun)
	the relation of corresponding in degree or size or amount

proportionate (adjective)	proportionateness (adjective)
being in due proportion
exhibiting equivalence or correspondence among constituents of an entity or between different entities
agreeing in amount, magnitude, or degree