cot vs lowboy

cot

noun
  • A cover or sheath; a fingerstall. 

  • A simple bed, especially one for portable or temporary purposes. 

  • A bed for infants or small children, with high, often slatted, often moveable sides. 

  • A wooden bed frame, slung by its corners from a beam, in which officers slept before the introduction of bunks. 

  • A pen, coop, or similar shelter for small domestic animals, such as sheep or pigeons. 

  • A small, crudely-formed boat. 

lowboy

noun
  • A low chest of drawers. 

  • A semi-trailer designed for hauling vehicles and other mobile equipment, with two drops in deck height: one right after the gooseneck and one right before the wheels; so named because the trailer's main deck is situated close to the ground for easy loading and unloading of vehicles and equipment. 

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