REARWARDS
back, backward, backwards, rearward, rearwards
(adverb) 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® 3.1
Etymology
Adjective
rearwards (comparative more rearwards, superlative most rearwards)
Rearward.
Adverb
rearwards (comparative more rearwards, superlative most rearwards)
Rearward.
Noun
rearwards
plural of rearward
Source: Wiktionary
REARWARD
Rear"ward`, n. Etym: [Rear + ward.]
Definition: The last troop; the rear of an army; a rear guard. Also used
figuratively. Shak.
Rear"ward, a. & adv.
Definition: At or toward the rear.
Source: Webster’s Unabridged Dictionary 1913 Edition