insulate vs segregate

insulate

verb
  • To separate, detach, or isolate. 

  • To separate a body or material from others, e.g. by non-conductors to prevent the transfer of electricity, heat, etc. 

segregate

verb
  • To separate, especially by social policies that directly or indirectly keep races or ethnic groups apart. 

adj
  • Separated from others of the same kind. 

  • Separate from a mass and collected together along lines of fraction. 

  • Separate; select. 

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