pudding head vs stupid

pudding head and stupid both are nouns.

Word	Noun	Adjective	Verb	Adverb
pudding head	Yes	No	No	No
stupid	Yes	Yes	No	No

As nouns, pudding head and stupid are synonyms defined as:

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

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

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