piling vs two-byfour

piling

noun
  • A structural support comprising a length of wood, steel, or other construction material. 

  • The act of heaping up. 

  • The process of building up, heating, and working fagots or piles to form bars, etc. 

two-byfour

How often have the words piling and two-byfour occurred in a corpus of books? (source: Google Ngram Viewer )