Falco rusticolus vs gyrfalcon

Falco rusticolus and gyrfalcon both are nouns.

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

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

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

Other synonyms of Falco rusticolus include gerfalcon.

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