lop vs tree fork

lop

noun
  • That which is lopped from anything, such as branches from a tree. 

  • Any of several breeds of rabbits whose ears lie flat. 

  • A flea. 

verb
  • To hang downward; to be pendent; to lean to one side. 

  • To allow to hang down. 

  • To cut off as the top or extreme part of anything, especially to prune a small limb off a shrub or tree, or sometimes to behead someone. 

tree fork

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

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