pudding head vs dullard

pudding head and dullard both are nouns.

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

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

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

pudding head (noun)	dullard (noun)
a person who is not very bright	a person who evokes boredom
	a person who is not very bright