knurl vs weal

knurl

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

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

  • A contorted knot in wood. 

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

weal

verb
  • To mark with stripes; to wale. 

noun
  • Boon, benefit. 

  • A raised, longitudinal wound, usually purple, on the surface of flesh caused by a stroke of a rod or whip; a welt. 

  • Specifically, the general happiness of a community, country etc. (often with qualifying word). 

  • Welfare, prosperity. 

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