scops owl vs bird of night

scops owl and bird of night both are nouns.

Word	Noun	Adjective	Verb	Adverb
scops owl	Yes	No	No	No
bird of night	Yes	No	No	No

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

scops owl: any of several small owls having ear tufts and a whistling call
bird of night: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of scops owl include bird of Minerva, hooter, owl.

scops owl (noun)	bird of night (noun)
any of several small owls having ear tufts and a whistling call	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes