hogshead vs urn

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. 

urn

noun
  • A measure of capacity for liquids, containing about three gallons and a half, wine measure. It was half the amphora, and four times the congius. 

  • A vase with a footed base. 

  • A metal vessel for serving tea or coffee. 

  • A vessel for the ashes or cremains of a deceased person. 

  • Any place of burial; the grave. 

  • A hollow body shaped like an urn, in which the spores of mosses are contained; a spore case; a theca. 

verb
  • To place in an urn. 

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