greyback vs Calidris canutus

greyback and Calidris canutus both are nouns.

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

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

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

Other synonyms of greyback include grayback, knot.

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