bludgeon vs conk buster

bludgeon

noun
  • A short, heavy club, often of wood, which is thicker or loaded at one end. 

verb
  • To coerce someone, as if with a bludgeon. 

  • To strike or hit with something hard, usually on the head; to club. 

conk buster

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