fathead vs goofball

fathead and goofball both are nouns.

Word	Noun	Adjective	Verb	Adverb
fathead	Yes	No	No	No
goofball	Yes	No	No	No

As nouns, fathead and goofball are synonyms defined as:

Other synonyms of fathead include bozo, cuckoo, goof, goose, jackass, twat, zany.

fathead (noun)	goofball (noun)
a man who is a stupid incompetent fool	a man who is a stupid incompetent fool
	a person who amuses others by ridiculous behavior