equiponderance vs poundage

equiponderance

noun
  • The state of being equal in weight; equipoise 

poundage

noun
  • weight, especially body weight 

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

  • a weight measured in pounds 

  • 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 

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

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