melioration vs amelioration

melioration and amelioration both are nouns.

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

As nouns, melioration and amelioration are synonyms defined as:

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

Other synonyms of melioration include betterment.

melioration (noun)	amelioration (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