English to English

noun (n)

• the fleshy part of the human body that you sit on(noun.body)

  Synonym:
  arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, keister, nates, posterior, prat, rear, rear end, rump
  

  source: wordnet30
• the part of an animal that corresponds to the human buttocks(noun.animal)

  Synonym:
  croup, croupe, rump
  

  source: wordnet30