proration vs prorate

proration is a noun but prorate is not a noun.

Word	Noun	Adjective	Verb	Adverb
proration	Yes	No	No	No
prorate	No	No	Yes	No

proration (noun)	prorate (noun)
the proportional limitation of production or distribution of something (e.g. crude oil or natural gas) to some fractional part of the total capacity of each producer

proration (verb)	prorate (verb)
	divide or assess proportionally
	make a proportional settlement or distribution