Adverbial rearwards has 1 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"
,Noun rearward has 1 sense
  1. rearward - direction toward the rear; "his outfit marched to the rearward of the tank divisions"
    --1 is a kind of
    rear, backside, back end
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