sunder vs toenail

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 

toenail

verb
  • To fasten two pieces of lumber together by applying nails or screws into both boards at an angle. 

noun
  • The thin, horny, transparent plate covering the upper surface of the end of a toe. 

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