refine vs over-refine

refine and over-refine both are verbs.

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

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

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

refine (verb)	over-refine (verb)
reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities	refine too much or with excess of subtlety
improve or perfect by pruning or polishing
treat or prepare so as to put in a usable condition
attenuate or reduce in vigor, strength, or intensity by polishing or purifying
make more precise or increase the discriminatory powers of
make more complex, intricate, or richer