cake vs layer cake

cake and layer cake both are nouns.

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

As nouns, layer cake is a hyponym of cake; that is, layer cake is a word with a more specific, narrower meaning than cake:

cake: baked goods made from or based on a mixture of flour, sugar, eggs, and fat
layer cake: cake having layers held together by a sweet filling and usually covered with frosting

cake (noun)	layer cake (noun)
a block of solid substance (such as soap or wax)	cake having layers held together by a sweet filling and usually covered with frosting
baked goods made from or based on a mixture of flour, sugar, eggs, and fat
small flat mass of chopped or ground food

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