piggin vs sixpence

piggin

noun
  • A small pail, can or ladle with the handle on the side; a lading-can. In the colonial era, some buckets were made like a small barrel, but with one stave left extra long. This stave would be carved into a handle so the bucket could be used as an oversized scoop for scattering grain, slopping the hogs, etc. 

sixpence

noun
  • A former British coin worth sixpence, first minted in 1551. 

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