boff vs knap

boff

noun
  • A hit or smack. 

  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

verb
  • to have sexual intercourse (with someone) 

  • To hit; to strike. 

knap

noun
  • A sharp blow or slap. 

  • A protuberance; a swelling; a knob. 

  • A small hill 

  • The crest of a hill 

verb
  • To rap or strike sharply. 

  • To shape a brittle material having conchoidal fracture, usually a mineral (flint, obsidian, chert etc.), by breaking away flakes, often forming a sharp edge or point. 

  • To make a sound of snapping. 

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