operetta vs opera bouffe

operetta and opera bouffe both are nouns.

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

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

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

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

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