melodic phrase vs tune

melodic phrase and tune both are nouns.

Word	Noun	Adjective	Verb	Adverb
melodic phrase	Yes	No	No	No
tune	Yes	No	Yes	No

As nouns, melodic phrase and tune are synonyms defined as:

melodic phrase and tune: a succession of notes forming a distinctive sequence

Other synonyms of melodic phrase include air, line, melodic line, melody, strain.

melodic phrase (noun)	tune (noun)
a succession of notes forming a distinctive sequence	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

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