fine-tune vs tweak

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

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

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

fine-tune (noun)	tweak (noun)
	a squeeze with the fingers

fine-tune (verb)	tweak (verb)
adjust finely	adjust finely
improve or perfect by pruning or polishing	to be under the influence of methamphetamine
make fine adjustments or divide into marked intervals for optimal measuring	pull or pull out sharply
	pinch or squeeze sharply