goofball vs cuckoo

goofball and cuckoo both are nouns.

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

As nouns, goofball and cuckoo are synonyms defined as:

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

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

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