complexity vs hot seat

complexity

noun
  • That which is and renders complex; intricacy; complication. 

  • The state of being complex; intricacy; entanglement. 

hot seat

noun
  • Any stressful situation. 

  • The seat occupied by a game show contestant at a stage where they are answering questions alone. 

  • The electric chair. 

  • A multiplayer game mode where the players take turns playing the game. 

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