ameliorate vs better

ameliorate is not a noun while better is a noun.

Word	Noun	Adjective	Verb	Adverb
ameliorate	No	No	Yes	No
better	Yes	Yes	Yes	Yes

As verbs, ameliorate and better are synonyms defined as:

Other synonyms of ameliorate include improve, meliorate.

As verbs, ameliorate and better are synonyms defined as:

Other synonyms of ameliorate include amend, improve, meliorate.

ameliorate (noun)	better (noun)
	something superior in quality or condition or effect
	the superior one of two alternatives
	someone who bets
	a superior person having claim to precedence

ameliorate (adjective)	better (adjective)
	(comparative of `good') superior to another (of the same class or set or kind) in excellence or quality or desirability or suitability; more highly skilled than another
	(comparative of `good') changed for the better in health or fitness
	(comparative and superlative of `well') wiser or more advantageous and hence advisable
	more than half

ameliorate (adverb)	better (adverb)
	comparative of `well'; in a better or more excellent manner or more advantageously or attractively or to a greater degree etc.
	from a position of superiority or authority