proportional vs proportionate

proportional is a noun but proportionate is not a noun.

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

proportional (noun)	proportionate (noun)
one of the quantities in a mathematical proportion

proportional (adjective)	proportionate (adjective)
properly related in size or degree or other measurable characteristics; usually followed by `to'	being in due proportion
having a constant ratio	exhibiting equivalence or correspondence among constituents of an entity or between different entities
	agreeing in amount, magnitude, or degree