sandbagger vs stickup

sandbagger

noun
  • A robber who uses a sandbag to stun victims. 

  • One who sandbags (misleads about his/her ability level in order to win bets); a hustler. 

stickup

noun
  • A robbery at gunpoint. 

  • A small-diameter tree branch or limb that extends out of the water in flooded or submerged timber, as in a lake or river. 

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