Strix nebulosa vs great gray owl

Strix nebulosa and great gray owl both are nouns.

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

As nouns, Strix nebulosa and great gray owl are synonyms defined as:

Strix nebulosa and great gray owl: large dish-faced owl of northern North America and western Eurasia

Other synonyms of Strix nebulosa include great grey owl.

Strix nebulosa (noun)	great gray owl (noun)
large dish-faced owl of northern North America and western Eurasia	large dish-faced owl of northern North America and western Eurasia