fine-tune vs refine

fine-tune and refine both are verbs.

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

As verbs, fine-tune and refine are synonyms defined as:

Other synonyms of fine-tune include down, polish.

fine-tune (verb)	refine (verb)
adjust finely	reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
improve or perfect by pruning or polishing	improve or perfect by pruning or polishing
make fine adjustments or divide into marked intervals for optimal measuring	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