tenon vs treenail

tenon

noun
  • A projecting member left by cutting away the wood around it, and made to insert into a mortise, and in this way secure together the parts of a frame. 

verb
  • To fit with tenons. 

  • To make into a tenon. 

treenail

noun
  • A wooden peg or pin used as a fastener. 

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