timber vs tree fork

timber

noun
  • Trees in a forest regarded as a source of wood. 

  • The wooden stock of a rifle or shotgun. 

  • Material for any structure. 

  • Wood that has been pre-cut and is ready for use in construction. 

  • A heavy wooden beam, generally a whole log that has been squared off and used to provide heavy support for something such as a roof. 

intj
  • Used by loggers to warn others that a tree being felled is falling. 

verb
  • To light or land on a tree. 

  • To surmount as a timber does. 

  • To fit with timbers. 

tree fork

noun
  • A bifurcation in the trunk of a tree giving rise to two roughly equal diameter branches. 

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