whap vs zonk

whap

verb
  • To strike hard and suddenly. 

  • She whapped down on the floor. 

  • To throw oneself quickly, or by an abrupt motion; to turn suddenly. 

noun
  • A blow; a hit; a whop. 

intj
  • The sound of sudden blow or hit. 

zonk

verb
  • To hit hard . 

  • To make (someone) sleepy or delirious, to put into a stupor . 

  • To become exhausted, sleepy or delirious. 

noun
  • The feeling of a drug taking hold. 

  • An unfavorable card or token, or undesirable or worthless item used as a prize in a contest or game show (such as Let's Make a Deal). 

  • A cigarette hand-rolled from tobacco and cannabis. 

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