cuckoo vs goofball

cuckoo and goofball both are nouns.

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

As nouns, cuckoo and goofball are synonyms defined as:

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

cuckoo (noun)	goofball (noun)
any of numerous European and North American birds having pointed wings and a long tail	a man who is a stupid incompetent fool
a man who is a stupid incompetent fool	a person who amuses others by ridiculous behavior

cuckoo (verb)	goofball (verb)
repeat monotonously, like a cuckoo repeats his call