amalgamate vs insulate

amalgamate

adj
  • Coalesced; united; combined. 

verb
  • To combine (free groups) by identifying respective isomorphic subgroups. 

  • To merge, to combine, to blend, to join. 

  • To make an alloy of a metal and mercury. 

insulate

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

  • To separate, detach, or isolate. 

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