- Rebel, Reb, Johnny Reb, Johnny, grayback - `johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `grayback' derived from their gray Confederate uniforms
--1 is a kind of Confederate soldier
- grayback, Limnodromus griseus - a dowitcher with a gray back
--2 is a kind of dowitcher
- knot, grayback, Calidris canutus - a sandpiper that breeds in the arctic and winters in the southern hemisphere
--3 is a kind of sandpiper
--3 is a member of Calidris, genus Calidris