goofball vs jackass

goofball and jackass both are nouns.

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

As nouns, goofball and jackass are synonyms defined as:

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

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