ballet vs comedy ballet

ballet and comedy ballet both are nouns.

Word	Noun	Adjective	Verb	Adverb
ballet	Yes	No	No	No
comedy ballet	Yes	No	No	No

As nouns, comedy ballet is a hyponym of ballet; that is, comedy ballet is a word with a more specific, narrower meaning than ballet:

ballet: a theatrical representation of a story that is performed to music by trained dancers
comedy ballet: a ballet that stresses the drama with features of comedy

Other hyponyms of ballet include classical ballet, modern ballet.

ballet (noun)	comedy ballet (noun)
a theatrical representation of a story that is performed to music by trained dancers	a ballet that stresses the drama with features of comedy
music written for a ballet