bum vs posterior

bum

noun
  • The buttocks. 

  • The anus. 

  • A drinking spree. 

  • A lazy, incompetent, or annoying person, usually a man. 

  • A homeless person, usually a man. 

  • A player or racer who often performs poorly. 

adj
  • Of poor quality or highly undesirable. 

  • Unfair. 

  • Injured and without the possibility of full repair, defective. 

  • Unpleasant or unhappy. 

verb
  • To ask someone to give one (something) for free; to beg for something. 

  • To wet the end of a marijuana cigarette (spliff). 

  • To sodomize; to engage in anal sex. 

  • To make a murmuring or humming sound. 

  • To stay idle and unproductive, like a hobo or vagabond. 

  • To depress; to make unhappy. 

intj
  • An expression of annoyance. 

posterior

noun
  • The hinder parts of the body. 

  • The probability that a hypothesis is true (calculated by Bayes' theorem). 

adj
  • Following in order or in time. 

  • Next to, or facing the main stem or axis. 

  • Relating to or denoting presentation of a fetus in which the rear or caudal end is nearest the cervix and emerges first at birth. 

How often have the words bum and posterior occurred in a corpus of books? (source: Google Ngram Viewer )