pendulum vs poundage

pendulum

noun
  • A watch's guard-ring by which it is attached to a chain. 

  • Used to refer to the tendency of a situation to oscillate (between two extremes). 

  • A lamp, etc. suspended from a ceiling. 

  • A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks. 

poundage

verb
  • To collect, as poundage; to assess, or rate, by poundage. 

noun
  • a charge based on the value of something in pounds sterling 

  • a weight measured in pounds 

  • weight, especially body weight 

  • a charge based on the weight of something in pounds 

  • a fee charged for keeping an animal in a pound, or for its release 

  • the keeping of an animal in a pound 

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