oilskin vs tarpaulin

oilskin

noun
  • Foul-weather gear worn by sailors, whether of natural or synthetic materials. 

  • Cloth made from cotton and treated with oil and pigment to make it waterproof. 

  • A raincoat made from cotton fabric treated with oil and pigment to make it waterproof. 

tarpaulin

noun
  • A hat made of, or covered with, painted or tarred cloth, worn by sailors and others. 

  • A tarp, a heavy, waterproof sheet of material, often cloth, used as a cover or blanket. 

verb
  • To cover with a tarpaulin. 

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