compass vs frontier

compass

verb
  • To go about or round entirely; to traverse. 

  • To surround; to encircle; to environ; to stretch round. 

noun
  • A pair of compasses (a device used to draw an arc or circle). 

  • A magnetic or electronic device used to determine the cardinal directions (usually magnetic or true north). 

  • The range of notes of a musical instrument or voice. 

  • Moderate bounds, limits of truth; moderation; due limits; used with within. 

frontier

verb
  • To live as pioneers on frontier territory. 

noun
  • The part of a country which borders or faces another country or unsettled region. 

  • The most advanced or recent version of something; leading edge. 

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