blunder vs screw up

blunder

verb
  • To cause to make a mistake. 

  • To make a clumsy or stupid mistake. 

  • To do or treat in a blundering manner; to confuse. 

  • To move blindly or clumsily. 

noun
  • A clumsy or embarrassing mistake. 

  • A very bad move, usually caused by some tactical oversight. 

screw up

verb
  • To blunder; to make a mistake. 

  • To twist into a contorted state. 

  • To raise or summon up. 

  • To tighten or secure with screws. 

  • To make a mess of; to ruin. 

  • To raise (rent, fees, etc.) to extortionate levels. 

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