Strix nebulosa vs owl

Strix nebulosa and owl both are nouns.

Word	Noun	Adjective	Verb	Adverb
Strix nebulosa	Yes	No	No	No
owl	Yes	No	No	No

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

Strix nebulosa: large dish-faced owl of northern North America and western Eurasia
owl: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of Strix nebulosa include bird of Minerva, bird of night, hooter.

Strix nebulosa (noun)	owl (noun)
large dish-faced owl of northern North America and western Eurasia	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes