assart vs clearing

assart

noun
  • Forest land cleared for agriculture. 

verb
  • To clear forest land for agriculture; remove stumps. 

clearing

noun
  • An area of land within a wood or forest devoid of trees. 

  • A sequence of events used to disconnect a call, and return to the ready state. 

  • The act or process of making or becoming clear. 

  • The period in which remaining university places are allocated to remaining students. 

  • A process of exchanging transaction information and authorisation through a central institution or system to complete and settle those transactions. 

  • The act of removing the ball from one's own goal area by kicking it. 

  • An open space in the fog etc. 

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