gyrfalcon vs Falco rusticolus

gyrfalcon and Falco rusticolus both are nouns.

Word	Noun	Adjective	Verb	Adverb
gyrfalcon	Yes	No	No	No
Falco rusticolus	Yes	No	No	No

As nouns, gyrfalcon and Falco rusticolus are synonyms defined as:

gyrfalcon and Falco rusticolus: large and rare Arctic falcon having white and dark color phases

Other synonyms of gyrfalcon include gerfalcon.

gyrfalcon (noun)	Falco rusticolus (noun)
large and rare Arctic falcon having white and dark color phases	large and rare Arctic falcon having white and dark color phases