tea room vs tearoom

tea room

tearoom

noun
  • A public lavatory, particularly (US gay slang, dated) as a meeting place for homosexual men. 

  • A room in a workplace set aside for tea breaks, lunch breaks, snacking, etc.; a break room. 

  • A café which serves tea, usually with light food. 

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