tawny owl vs hooter

tawny owl and hooter both are nouns.

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

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

tawny owl: reddish-brown European owl having a round head with black eyes
hooter: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

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

tawny owl (noun)	hooter (noun)
reddish-brown European owl having a round head with black eyes	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