medley vs musical composition

medley and musical composition both are nouns.

Word	Noun	Adjective	Verb	Adverb
medley	Yes	No	No	No
musical composition	Yes	No	No	No

As nouns, musical composition is a hypernym of medley; that is, musical composition is a word with a broader meaning than medley:

medley: a musical composition consisting of a series of songs or other musical pieces from various sources
musical composition: a musical work that has been created

Other hypernyms of medley include composition, opus, piece, piece of music.

medley (noun)	musical composition (noun)
a musical composition consisting of a series of songs or other musical pieces from various sources	a musical work that has been created