fish ball vs gefilte fish

fish ball and gefilte fish both are nouns.

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

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

fish ball and gefilte fish: well-seasoned balls of ground fish and eggs and crushed crumbs simmered in fish stock

fish ball (noun)	gefilte fish (noun)
well-seasoned balls of ground fish and eggs and crushed crumbs simmered in fish stock	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