polish vs over-refine

polish is a noun but over-refine is not a noun.

Word	Noun	Adjective	Verb	Adverb
polish	Yes	No	Yes	No
over-refine	No	No	Yes	No

As verbs, over-refine is a hyponym of polish; that is, over-refine is a word with a more specific, narrower meaning than polish:

Other hyponyms of polish include overrefine, civilise, civilize, cultivate, educate, school, train.

polish (noun)	over-refine (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)	over-refine (verb)
bring to a highly developed, finished, or refined state	refine too much or with excess of subtlety
improve or perfect by pruning or polishing
make (a surface) shine