tune up vs tune

tune up is not a noun while tune is a noun.

Word	Noun	Adjective	Verb	Adverb
tune up	No	No	Yes	No
tune	Yes	No	Yes	No

As verbs, tune up and tune are synonyms defined as:

As verbs, tune up and tune are synonyms defined as:

tune up (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

tune up (verb)	tune (verb)
adjust the pitches of (musical instruments)	adjust the pitches of (musical instruments)
adjust for (better) functioning	adjust for (better) functioning