Calidris canutus vs greyback

Calidris canutus and greyback both are nouns.

Word	Noun	Adjective	Verb	Adverb
Calidris canutus	Yes	No	No	No
greyback	Yes	No	No	No

As nouns, Calidris canutus and greyback are synonyms defined as:

Calidris canutus and greyback: a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere

Other synonyms of Calidris canutus include grayback, knot.

Calidris canutus (noun)	greyback (noun)
a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere	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