epigonic vs rearguard

epigonic

adj
  • Being or relating to an epigone or disciple; imitative. 

rearguard

noun
  • The rearmost part of a force, especially a detachment of troops that protect the rear of a retreating force. 

  • The defence, collectively the defenders. 

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