| quadruped(noun, animal, creature, person, being) |
| annulment(back, slow, backward, reverse direction) |
| aquatic mammal(animal, creature, class, being) |
| atavism(back, slow, backward, reverse direction) |
| atavist(back, slow, backward, reverse direction) |
| backset(back, slow, backward, reverse direction) |
| backsliding(back, slow, backward, reverse direction) |
| backward deviation(back, slow, backward, reverse direction) |
| backward motion(back, slow, backward, reverse direction) |
| backward step(back, slow, backward, reverse direction) |
| backwardation(back, slow, backward, reverse direction) |
| bloomer(back, slow, backward, reverse direction) |
| cancellation(back, slow, backward, reverse direction) |
| check(back, slow, backward, reverse direction) |
| checkmate(back, slow, backward, reverse direction) |
| come back(back, slow, backward, reverse direction) |
| comedown(back, slow, backward, reverse direction) |
| decline(back, slow, backward, reverse direction) |
| descent(back, slow, backward, reverse direction) |
| deterioration(back, slow, backward, reverse direction) |