"rearwards" in the noun sense
direction toward the rear
"his outfit marched to the rearward of the tank divisions"
"rearwards" in the adverb sense
1. back, backward, backwards, rearward, rearwards
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"
Source: WordNet® (An amazing lexical database of English)
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