pail vs waterpot

pail

noun
  • A vessel of wood, tin, plastic, etc., usually cylindrical and having a handle -- used especially for carrying liquids, for example water or milk; a bucket (sometimes with a cover). 

  • A closed (covered) cylindrical shipping container. 

waterpot

noun
  • A pot or jug for holding water. 

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