cake vs fish cake

cake and fish cake both are nouns.

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

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

Other hyponyms of cake include fish ball.

cake (noun)	fish cake (noun)
a block of solid substance (such as soap or wax)	a fried ball or patty of flaked fish and mashed potatoes
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)	fish cake (verb)
form a coat over