little owl vs bird of Minerva

little owl and bird of Minerva both are nouns.

Word	Noun	Adjective	Verb	Adverb
little owl	Yes	No	No	No
bird of Minerva	Yes	No	No	No

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

little owl: small European owl
bird of Minerva: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of little owl include bird of night, hooter, owl.

little owl (noun)	bird of Minerva (noun)
small European owl	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes