factionate vs sunder

factionate

verb
  • Synonym of factionalize 

adj
  • Showing great loyalty to one's faction; tribal. 

sunder

verb
  • To part, separate. 

  • To break or separate or to break apart, especially with force. 

noun
  • a separation into parts; a division or severance 

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