cake vs fish ball

cake and fish ball both are nouns.

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

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

Other hyponyms of cake include fish cake.

cake (noun)	fish ball (noun)
a block of solid substance (such as soap or wax)	well-seasoned balls of ground fish and eggs and crushed crumbs simmered in fish stock
baked goods made from or based on a mixture of flour, sugar, eggs, and fat	a fried ball or patty of flaked fish and mashed potatoes
small flat mass of chopped or ground food

cake (verb)	fish ball (verb)
form a coat over