nitwit vs doofus

nitwit and doofus both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitwit	Yes	No	No	No
doofus	Yes	No	No	No

As nouns, nitwit and doofus are synonyms defined as:

Other synonyms of nitwit include dimwit, half-wit.

nitwit (noun)	doofus (noun)
a stupid incompetent person	a stupid incompetent person