melodic line vs melodic phrase

melodic line and melodic phrase both are nouns.

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

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

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

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

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