knap vs thunk

knap

verb
  • To make a sound of snapping. 

  • 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. 

noun
  • A protuberance; a swelling; a knob. 

  • A small hill 

  • A sharp blow or slap. 

  • The crest of a hill 

thunk

verb
  • To strike against something, without breakage, making a "thunk" sound. 

  • To delay (a computation). 

  • To execute (code) by means of a thunk. 

noun
  • A specialized subroutine that one software module uses to execute code in another module. 

  • In the Scheme programming language, a function or procedure taking no arguments. 

  • A delayed computation. 

intj
  • Representing the dull sound of the impact of a heavy object striking another and coming to an immediate standstill, with neither object being broken by the impact. 

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