rearward vs tail end

rearward

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

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

• Toward the back or rear of something. 

• Toward the back or rear of something. 

tail end

• The last part of a period of time, event, or situation; the concluding or final part. 

• The hindmost part of anything (a person, animal, or object), the rear end; the butt, buttocks; hindquarters, rump.