light opera vs comic opera

light opera and comic opera both are nouns.

Word	Noun	Adjective	Verb	Adverb
light opera	Yes	No	No	No
comic opera	Yes	No	No	No

As nouns, comic opera is a hypernym of light opera; that is, comic opera is a word with a broader meaning than light opera:

light opera: a short amusing opera
comic opera: opera with a happy ending and in which some of the text is spoken

Other hypernyms of light opera include bouffe, opera bouffe, opera comique.

light opera (noun)	comic opera (noun)
a short amusing opera	opera with a happy ending and in which some of the text is spoken