jackass vs goofball

jackass and goofball both are nouns.

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

As nouns, jackass and goofball are synonyms defined as:

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

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