horned owl vs hooter

horned owl and hooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
horned owl	Yes	No	No	No
hooter	Yes	No	No	No

As nouns, hooter is a hypernym of horned owl; that is, hooter is a word with a broader meaning than horned owl:

horned owl: large owls having prominent ear tufts
hooter: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of horned owl include bird of Minerva, bird of night, owl.

horned owl (noun)	hooter (noun)
large owls having prominent ear tufts	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes
	a device on an automobile for making a warning noise
	informal terms for the nose