plectrum vs toenail

plectrum

noun
  • A small piece of plastic, metal, ivory, etc., for plucking the strings of a guitar, lyre, mandolin, etc. 

  • A projection of bone or other stiff tissue, such as the ridges in some insects' stridulatory organs. 

toenail

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

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

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