potpourri vs piece of music

potpourri and piece of music both are nouns.

Word	Noun	Adjective	Verb	Adverb
potpourri	Yes	No	No	No
piece of music	Yes	No	No	No

As nouns, piece of music is a hypernym of potpourri; that is, piece of music is a word with a broader meaning than potpourri:

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

Other hypernyms of potpourri include composition, musical composition, opus, piece.

potpourri (noun)	piece of music (noun)
a jar of mixed flower petals and spices used as perfume	a musical work that has been created
a musical composition consisting of a series of songs or other musical pieces from various sources
a collection containing a variety of sorts of things