exotic vs two a penny

exotic

noun
  • Any exotic particle. 

  • An organism that is exotic to an environment. 

  • An exotic dancer; a stripteaser. 

adj
  • Non-native to the ecosystem. 

  • Being or relating to various wagers, such as the trifecta, that involve betting on the finishing positions of multiple competitors across one or more races. 

  • Being or relating to an option with features that make it more complex than commonly traded options. 

  • Foreign, especially in an exciting way. 

two a penny

adj
  • very common; cheap 

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