posterior vs rearmost

posterior

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

  • Following in order or in time. 

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

noun
  • The hinder parts of the body. 

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

rearmost

adj
  • Furthest to the rear. 

  • The rearmost member of the strike team walked backward to guard them from a surprise attack from behind. 

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