pudden-head vs stupid person

pudden-head and stupid person both are nouns.

Word	Noun	Adjective	Verb	Adverb
pudden-head	Yes	No	No	No
stupid person	Yes	No	No	No

As nouns, pudden-head and stupid person are synonyms defined as:

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

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