light opera vs opera bouffe

light opera and opera bouffe both are nouns.

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

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

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

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

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