blindside vs frustration

blindside

noun
  • A person's weak point. 

  • The blindside flanker, a position in rugby union, usually number 6. 

  • A tram/train driver's field of blindness around a tram (trolley/streetcar) or a train; the side areas behind the tram/train driver. 

  • The space on the side of the pitch with the shorter distance between the breakdown/set piece and the touchline; compare openside. 

  • A driver's field of blindness around an automobile; the side areas behind the driver. 

verb
  • To attack (a person) on his or her blind side. 

  • To catch off guard; to take by surprise. 

frustration

noun
  • The feeling of annoyance at impassibility from resistance. 

  • A thing that frustrates. 

  • The state of contract that allows a party to back away from its contractual obligations due to (unforeseen) radical changes to the nature of the thing a party has been obligated to. 

  • The act of frustrating, or the state, or an instance of being frustrated. 

  • Anger not directed at anything or anyone in particular. 

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