csardas vs piece of music

csardas and piece of music both are nouns.

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

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

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

csardas (noun)	piece of music (noun)
a piece of music composed for the Hungarian Csárdás dance.	a musical work that has been created
a piece of music in the rhythm of the Hungarian Csárdás dance.