cuckoo vs roadrunner

cuckoo and roadrunner both are nouns.

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

As nouns, roadrunner is a hyponym of cuckoo; that is, roadrunner is a word with a more specific, narrower meaning than cuckoo:

cuckoo: any of numerous European and North American birds having pointed wings and a long tail
roadrunner: speedy largely terrestrial bird found from California and Mexico to Texas

cuckoo (noun)	roadrunner (noun)
any of numerous European and North American birds having pointed wings and a long tail	speedy largely terrestrial bird found from California and Mexico to Texas
a man who is a stupid incompetent fool

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