trio vs piece of music

trio and piece of music both are nouns.

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

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

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

trio (noun)	piece of music (noun)
a musical composition for three performers	a musical work that has been created
three people considered as a unit
a set of three similar things considered as a unit
three performers or singers who perform together
the cardinal number that is the sum of one and one and one