fish ball vs fish cake

fish ball and fish cake both are nouns.

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

As nouns, fish ball and fish cake are synonyms defined as:

fish ball and fish cake: a fried ball or patty of flaked fish and mashed potatoes

fish ball (noun)	fish cake (noun)
well-seasoned balls of ground fish and eggs and crushed crumbs simmered in fish stock	a fried ball or patty of flaked fish and mashed potatoes
a fried ball or patty of flaked fish and mashed potatoes