burlap vs sailcloth

burlap

noun
  • A very strong, coarse cloth, made from jute, flax, or hemp, and used to make sacks, etc. 

verb
  • To wrap or cover in burlap. 

sailcloth

noun
  • A strong, durable fabric suitable for making sails for ships or boats. 

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