fish finger vs fish stick

fish finger and fish stick both are nouns.

Word	Noun	Adjective	Verb	Adverb
fish finger	Yes	No	No	No
fish stick	Yes	No	No	No

As nouns, fish finger and fish stick are synonyms defined as:

fish finger (noun)	fish stick (noun)
a long fillet of fish breaded and fried	a long fillet of fish breaded and fried