fine-tune vs tune

fine-tune is not a noun while tune is a noun.

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

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

Other hypernyms of fine-tune include tune up.

fine-tune (noun)	tune (noun)
	the adjustment of a radio receiver or other circuit to a required frequency
	the property of producing accurately a note of a given pitch
	a succession of notes forming a distinctive sequence

fine-tune (verb)	tune (verb)
adjust finely	adjust the pitches of (musical instruments)
improve or perfect by pruning or polishing	adjust for (better) functioning
make fine adjustments or divide into marked intervals for optimal measuring