fine-tune vs overrefine

fine-tune and overrefine both are verbs.

Word	Noun	Adjective	Verb	Adverb
fine-tune	No	No	Yes	No
overrefine	No	No	Yes	No

As verbs, overrefine is a hyponym of fine-tune; that is, overrefine is a word with a more specific, narrower meaning than fine-tune:

Other hyponyms of fine-tune include over-refine, civilise, civilize, cultivate, educate, school, train.

fine-tune (verb)	overrefine (verb)
adjust finely	refine too much or with excess of subtlety
improve or perfect by pruning or polishing
make fine adjustments or divide into marked intervals for optimal measuring