1. back, backward, backwards, rearward, rearwards

usage: at or to or toward the back or rear; "he moved back"; "tripped when he stepped backward"; "she looked rearward out the window of the car"

2. backward, backwards

usage: in a manner or order or direction the reverse of normal; "it's easy to get the `i' and the `e' backward in words like `seize' and `siege'"; "the child put her jersey on backward"

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