tune vs fine-tune

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

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

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

Other hyponyms of tune include tweak, service, tune in.

tune (noun)	fine-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

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