amelioration vs melioration

amelioration and melioration both are nouns.

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

As nouns, amelioration and melioration are synonyms defined as:

amelioration and melioration: the act of relieving ills and changing for the better

Other synonyms of amelioration include betterment.

amelioration (noun)	melioration (noun)
the act of relieving ills and changing for the better	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