pillock vs poor fish

pillock and poor fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
pillock	Yes	No	No	No
poor fish	Yes	No	No	No

As nouns, pillock and poor fish are synonyms defined as:

Other synonyms of pillock include dolt, dullard, pudden-head, pudding head, stupe, stupid, stupid person.

pillock (noun)	poor fish (noun)
a person who is not very bright	a person who is not very bright