polish vs meliorate

polish is a noun but meliorate is not a noun.

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

As verbs, meliorate is a hypernym of polish; that is, meliorate is a word with a broader meaning than polish:

Other hypernyms of polish include ameliorate, amend, better, improve.

polish (noun)	meliorate (noun)
the property of being smooth and shiny
a highly developed state of perfection; having a flawless or impeccable quality
a preparation used in polishing

polish (verb)	meliorate (verb)
bring to a highly developed, finished, or refined state	get better
improve or perfect by pruning or polishing	to make better
make (a surface) shine