rivet vs sharpness

rivet

noun
  • Any fixed point or certain basis. 

  • A cylindrical mechanical fastener that attaches multiple parts together by fitting through a hole and deforming the head(s) at either end. 

verb
  • To command the attention of. 

  • To attach or fasten parts by using rivets. 

  • To make firm or immovable. 

  • To install rivets. 

sharpness

noun
  • the fineness of the point a pointed object. 

  • acuteness or acuity. 

  • pungency or acidity. 

  • the cutting ability of an edge; keenness. 

  • The product or result of being sharp. 

  • distinctness, focus. 

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