pirogue vs pothole

pirogue

noun
  • A canoe of shallow draft, made by hollowing a log. 

  • A small flat-bottom boat of shallow draft. 

  • A boat-shaped food that is stuffed with seafood. 

pothole

noun
  • A pit formed in the bed of a turbulent stream. 

  • A shallow pit or other edged depression in a road's surface, especially when caused by erosion by weather or traffic. 

  • A pit resulting from unauthorized excavation by treasure hunters or vandals. 

  • A shallow hole dug for the purpose of prospecting for opal or gold. 

  • A hole or recess on the top of a stove into which a pot may be placed. 

  • A vertical cave system, often found in limestone. 

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