Twinkie vs sponge cake

Twinkie and sponge cake both are nouns.

Word	Noun	Adjective	Verb	Adverb
Twinkie	Yes	No	No	No
sponge cake	Yes	No	No	No

As nouns, sponge cake is a hypernym of Twinkie; that is, sponge cake is a word with a broader meaning than Twinkie:

Twinkie: a small sponge cake with a synthetic cream filling
sponge cake: a light porous cake made with eggs and flour and sugar without shortening

Twinkie (noun)	sponge cake (noun)
a small sponge cake with a synthetic cream filling	a light porous cake made with eggs and flour and sugar without shortening