screech owl vs bird of night

screech owl and bird of night both are nouns.

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

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

screech owl: small North American owl having hornlike tufts of feathers whose call sounds like a quavering whistle
bird of night: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

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

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

screech owl: any owl that has a screeching cry
bird of night: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

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

screech owl (noun)	bird of night (noun)
small North American owl having hornlike tufts of feathers whose call sounds like a quavering whistle	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes
any owl that has a screeching cry