over-refine vs refine

over-refine and refine both are verbs.

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

As verbs, refine is a hypernym of over-refine; that is, refine is a word with a broader meaning than over-refine:

Other hypernyms of over-refine include down, fine-tune, polish.

over-refine (verb)	refine (verb)
refine too much or with excess of subtlety	reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
	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