bulge vs knurl

bulge

noun
  • Something sticking out from a surface; a swelling, protuberant part; a bending outward, especially when caused by pressure. 

  • The outline of male genitals visible through clothing. 

  • A sudden rise in value or quantity. 

  • The bilge of a vessel. 

  • The bilge or protuberant part of a cask. 

verb
  • To bilge, as a ship; to founder. 

  • To stick out from (a surface). 

knurl

noun
  • A lined or crossgrained pattern of ridges or indentations rolled or pressed into a part for grip. 

  • A crossgrained protuberance; a nodule; a boss or projection. 

  • A contorted knot in wood. 

verb
  • To roll or press a pattern of ridges or indentations into a part for grip. 

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