caudal vs posterior

caudal

adj
  • Pertaining to the tail or posterior or hind part of a body. 

  • Toward the tail end (hind end) of the body; in bipeds such as humans, this direction corresponds to inferior. 

noun
  • A caudal vertebra. 

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). 

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