1) Aback 2) Aft 3) Astern 4) Back 5) Backward 6) Backwards 7) Rear 8) Rearwards 9) Reverse 1) Backward 2) Direction toward the rear 3) Reverse 4) To the rear 5) Toward the back 6) Towards the back 
• (a. & adv.) At or toward the rear. • (n.) The last troop; the rear of an army; a rear guard. Also used figuratively.
Rear'ward (-wẽrd) adjective & adverb At or toward the rear. Rear'ward` (rēr'ward`) noun [ Rear + ward .] The last troop; the rear of an army; a rear guard. Also used figuratively. Shak. 
[adj] - directed or moving toward the rear 2. [n] - direction toward the rear
reverse adjective directed or moving toward the rear; `a rearward glance`; `a rearward movement`