coffee cake vs cake

coffee cake and cake both are nouns.

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

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

coffee cake: a cake or sweet bread usually served with coffee
cake: baked goods made from or based on a mixture of flour, sugar, eggs, and fat

coffee cake (noun)	cake (noun)
a cake or sweet bread usually served with coffee	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

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