employment vs usance

employment

noun
  • A use, purpose 

  • The act of employing 

  • An activity to which one devotes time 

  • The number or percentage of people at work 

  • The work or occupation for which one is used, and often paid 

  • The state of being employed 

usance

noun
  • Use. 

  • Customary or habitual usage. 

  • The interest paid on a borrowed sum, usury. 

  • The length of time permitted for the payment of a bill of exchange. 

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