fair game vs twit

fair game

noun
  • An acceptable subject or target for criticism, scrutiny, mockery, or attack. 

  • A goal or an object that may legitimately be sought. 

  • Actions permissible by the rules. 

  • Used other than figuratively or idiomatically: see fair, game.: a game that is fair, that does not involve cheating, etc. 

twit

noun
  • A reproach, gibe or taunt. 

  • A foolish or annoying person. 

  • A person who twitters, i.e. chatters inanely. 

verb
  • To reproach, blame; to ridicule or tease. 

  • To ignore or killfile (a user on a bulletin board system). 

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