1) Confederate soldier 2) Fish common name 3) Johnny 4) Johnny reb 5) Rebel 1) Johnny 2) Reb 
[fish] Grayback is a general name given to several species of fish from North America, such as the alewife, cisco and Menominee whitefish. ==Geographic distribution== Found on the Atlantic coast from the Gulf of St. Lawrence and Nova Scotia to North Carolina, in streams and rivers, the Great Lakes, and in the Seneca and Cayuga Lakes. ...
• (n.) The dowitcher. • (n.) The body louse. • (n.) The California gray whale. • (n.) The redbreasted sandpiper or knot.
any of several North American fishes including the alewife (q.v.), cisco (see whitefish), and Menominee whitefish.
Gray'back` noun (Zoology) (a) The California gray whale. (b) The redbreasted sandpiper or knot. (c) The dowitcher. (d) The body louse. 
The USS Grayback was an American Tambor Class cruiser type submarine of 1475 tons displacement launched in 1941. the USS Grayback was powered by diesel engines providing a top speed of 22 knots surfaced and carried a complement of 55. She was armed with one 3 inch anti-aircraft gun; two anti-aircraft machine-guns; six bow 21 inch torpedo tubes and ...
[n] - a dowitcher with a gray back
noun a dowitcher with a grey back