tiramisu vs dessert

tiramisu and dessert both are nouns.

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

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

tiramisu: an Italian dessert consisting of layers of sponge cake soaked with coffee and brandy or liqueur layered with mascarpone cheese and topped with grated chocolate
dessert: a dish served as the last course of a meal

Other hypernyms of tiramisu include afters, sweet.

tiramisu (noun)	dessert (noun)
an Italian dessert consisting of layers of sponge cake soaked with coffee and brandy or liqueur layered with mascarpone cheese and topped with grated chocolate	a dish served as the last course of a meal