pudden-head vs poor fish

pudden-head and poor fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
pudden-head	Yes	No	No	No
poor fish	Yes	No	No	No

As nouns, pudden-head and poor fish are synonyms defined as:

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

pudden-head (noun)	poor fish (noun)
a person who is not very bright	a person who is not very bright