Strix varia vs bird of Minerva

Strix varia and bird of Minerva both are nouns.

Word	Noun	Adjective	Verb	Adverb
Strix varia	Yes	No	No	No
bird of Minerva	Yes	No	No	No

As nouns, bird of Minerva is a hypernym of Strix varia; that is, bird of Minerva is a word with a broader meaning than Strix varia:

Strix varia: large owl of eastern North America having its breast and abdomen streaked with brown
bird of Minerva: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of Strix varia include bird of night, hooter, owl.

Strix varia (noun)	bird of Minerva (noun)
large owl of eastern North America having its breast and abdomen streaked with brown	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes