doofus vs half-wit

doofus and half-wit both are nouns.

Word	Noun	Adjective	Verb	Adverb
doofus	Yes	No	No	No
half-wit	Yes	No	No	No

As nouns, doofus and half-wit are synonyms defined as:

Other synonyms of doofus include dimwit, nitwit.

doofus (noun)	half-wit (noun)
a stupid incompetent person	a stupid incompetent person
	a person of subnormal intelligence