signature vs melodic phrase

signature and melodic phrase both are nouns.

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

As nouns, melodic phrase is a hypernym of signature; that is, melodic phrase is a word with a broader meaning than signature:

signature: a melody used to identify a performer or a dance band or radio/tv program
melodic phrase: a succession of notes forming a distinctive sequence

Other hypernyms of signature include air, line, melodic line, melody, strain, tune.

signature (noun)	melodic phrase (noun)
a distinguishing style	a succession of notes forming a distinctive sequence
your name written in your own handwriting
a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book
the sharps or flats that follow the clef and indicate the key
a melody used to identify a performer or a dance band or radio/tv program