gatepost vs piling

gatepost

noun
  • a vertical post from which a gate is hung/attached. 

piling

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

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

  • The act of heaping up. 

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