caudal vs rearward

caudal

• Pertaining to the tail or posterior or hind part of a body. 

• Toward the tail end (hind end) of the body; in bipeds such as humans, this direction corresponds to inferior. 

• A caudal vertebra. 

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.