Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun backside

2 senses of backside

Sense 1
rear, backside, back end -- (the side of an object that is opposite its front; "his room was toward the rear of the hotel")
       => side, face -- (a surface forming part of the outside of an object; "he examined all sides of the crystal"; "dew dripped from the face of the leaf")

Sense 2
buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass -- (the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?")
       => body part -- (any part of an organism such as an organ or extremity)