hogshead vs vat

hogshead

noun
  • An English measure of capacity for liquids, containing 63 wine gallons, or about 52+¹⁄₂ imperial gallons; a half pipe. 

  • A large barrel or cask of indefinite contents, especially one containing from 100 to 140 gallons. 

vat

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

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

  • A vessel for holding holy water. 

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. 

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