pricket vs rush candle

pricket

noun
  • A spike for holding a single candle. 

  • A male deer in its second year, whose antlers have not yet branched. 

rush candle

noun
  • A candle of tallow or wax that uses a piece of rush as a wick. 

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