mousse vs dessert

mousse and dessert both are nouns.

Word	Noun	Adjective	Verb	Adverb
mousse	Yes	No	Yes	No
dessert	Yes	No	No	No

As nouns, dessert is a hypernym of mousse; that is, dessert is a word with a broader meaning than mousse:

mousse: a rich, frothy, creamy dessert made with whipped egg whites and heavy cream
dessert: a dish served as the last course of a meal

Other hypernyms of mousse include afters, sweet.

mousse (noun)	dessert (noun)
toiletry consisting of an aerosol foam used in hair styling	a dish served as the last course of a meal
a light creamy dish made from fish or meat and set with gelatin
a rich, frothy, creamy dessert made with whipped egg whites and heavy cream

mousse (verb)	dessert (verb)
apply a styling gel to