pound cake vs cake

pound cake and cake both are nouns.

Word	Noun	Adjective	Verb	Adverb
pound cake	Yes	No	No	No
cake	Yes	No	Yes	No

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

pound cake: rich loaf cake made of a pound each of butter and sugar and flour
cake: baked goods made from or based on a mixture of flour, sugar, eggs, and fat

Other hypernyms of pound cake include loaf.

pound cake (noun)	cake (noun)
rich loaf cake made of a pound each of butter and sugar and flour	a block of solid substance (such as soap or wax)
	baked goods made from or based on a mixture of flour, sugar, eggs, and fat
	small flat mass of chopped or ground food

pound cake (verb)	cake (verb)
	form a coat over