blockhead vs dolt

blockhead and dolt both are nouns.

Word	Noun	Adjective	Verb	Adverb
blockhead	Yes	No	No	No
dolt	Yes	No	No	No

As nouns, dolt is a hypernym of blockhead; that is, dolt is a word with a broader meaning than blockhead:

blockhead: a stupid person; these words are used to express a low opinion of someone's intelligence
dolt: a person who is not very bright

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

blockhead (noun)	dolt (noun)
a stupid person; these words are used to express a low opinion of someone's intelligence	a person who is not very bright