light opera vs opera comique

light opera and opera comique both are nouns.

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

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

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

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

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