czardas vs piece of music

czardas and piece of music both are nouns.

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

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

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

czardas (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.