backwards vs rearward

backwards

• Synonym of backward; see usage notes there. 

• Synonym of backward; see usage notes there. 

rearward

• Toward the back or rear of something. 

• The last troop; the rear of an army; a rear guard. 

• The part that comes last or is situated in the rear; conclusion, wind-up. 

• Toward the back or rear of something.