passage vs piece of music

passage and piece of music both are nouns.

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

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

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

passage (noun)	piece of music (noun)
a journey usually by ship	a musical work that has been created
the passing of a law by a legislative body
the act of passing something to another person
the act of passing from one state or place to the next
a bodily reaction of changing from one place or stage to another
a way through or along which someone or something may pass
a path or channel or duct through or along which something may pass
a section of text; particularly a section of medium length
a short section of a musical composition
the motion of one object relative to another