melioration vs meliorate

melioration is a noun but meliorate is not a noun.

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

melioration (noun)	meliorate (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

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