jackass vs cuckoo

jackass and cuckoo both are nouns.

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

As nouns, jackass and cuckoo are synonyms defined as:

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

jackass (noun)	cuckoo (noun)
male donkey	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

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