vat vs waterpot

vat

noun
  • A vessel for holding holy water. 

  • A square, hollow place on the back of a calcining furnace, where tin ore is laid to dry. 

  • A large tub, such as is used for making wine or for tanning. 

verb
  • To put into a vat. 

  • To blend (wines or spirits) in a vat; figuratively, to mix or blend elements as if with wines or spirits. 

waterpot

noun
  • A pot or jug for holding water. 

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