tawny owl vs owl

tawny owl and owl both are nouns.

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

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

tawny owl: reddish-brown European owl having a round head with black eyes
owl: 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, hooter.

tawny owl (noun)	owl (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