Limnodromus griseus vs greyback

Limnodromus griseus and greyback both are nouns.

Word	Noun	Adjective	Verb	Adverb
Limnodromus griseus	Yes	No	No	No
greyback	Yes	No	No	No

As nouns, Limnodromus griseus and greyback are synonyms defined as:

Other synonyms of Limnodromus griseus include grayback.

Limnodromus griseus (noun)	greyback (noun)
a dowitcher with a grey back	a dowitcher with a grey back
	a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere
	`Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms