backside
1. [ noun ] the side of an object that is opposite its front
Synonyms: rear back_end
Examples:

"his room was toward the rear of the hotel"

Related terms: front side rearward nape
2. [ noun ] the fleshy part of the human body that you sit on
Synonyms: seat ass bottom rear_end tail behind buttocks stern hind_end hindquarters keister posterior buns bum prat rear can tail_end tooshie tush rump fundament derriere fanny butt nates arse
Examples:

"he deserves a good kick in the butt" "are you going to sit on your fanny and do nothing?"

Related terms: body_part torso
Similar spelling:   backseat
  baked
  backed
  basket
  Baskett
  backstay