coping vs trackbed

coping

noun
  • The top layer of a brick wall, especially one that slopes in order to throw off water. 

  • Clipping the beak or talons of a bird. 

  • The process of managing taxing circumstances, expending effort to solve personal and interpersonal problems, and seeking to master, minimize, reduce or tolerate stress or conflict. 

trackbed

noun
  • The layer of gravel or other foundation on which a railway track is laid. 

  • The land on which a railway (especially one that has been closed or dismantled) was built; the roadbed for a railroad. 

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