paling vs purlin

paling

noun
  • A fence made of galvanized sheeting. 

  • A pointed stick used to make a fence. 

  • A fence made of palings. 

purlin

noun
  • A longitudinal structural member bridging two or more rafters of a roof. 

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