play house vs unite

play house

verb
  • To pretend to be a family in the household, acting out housekeeping and different family roles. 

  • To live as if married without actually being legally married. 

noun
  • A child's toy domestic dwelling, either for dolls or large enough for the child to enter. 

unite

verb
  • To bring together as one. 

  • To come together as one. 

noun
  • A British gold coin worth 20 shillings, first produced during the reign of King James I, and bearing a legend indicating the king's intention of uniting the kingdoms of England and Scotland. 

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