meliorate vs melioration

meliorate is not a noun while melioration is a noun.

Word	Noun	Adjective	Verb	Adverb
meliorate	No	No	Yes	No
melioration	Yes	No	No	No

meliorate (noun)	melioration (noun)
	the act of relieving ills and changing for the better
	the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning
	a condition superior to an earlier condition

meliorate (verb)	melioration (verb)
get better
to make better