stupid vs pudden-head

stupid and pudden-head both are nouns.

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

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

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

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

stupid (adjective)	pudden-head (adjective)
lacking or marked by lack of intellectual acuity
lacking intelligence
in a state of mental numbness especially as resulting from shock