disband vs sunder

disband

verb
  • To break up or (cause to) cease to exist; to disperse. 

sunder

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

  • To part, separate. 

noun
  • a separation into parts; a division or severance 

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