clinic vs operating theatre

clinic

noun
  • A hospital session to diagnose or treat patients. 

  • A medical facility, such as a hospital, especially one for the treatment and diagnosis of outpatients. 

  • A group practice of several physicians or other health professionals. 

  • A meeting for the diagnosis of problems, or training, on a particular subject. 

  • A temporary office arranged on a regular basis to allow politicians to meet their constituents. 

  • A series of workouts used to build skills of practitioners regardless of team affiliation. 

operating theatre

noun
  • A room in a hospital used for performing surgery (originally designed for operations in front of observers). 

How often have the words clinic and operating theatre occurred in a corpus of books? (source: Google Ngram Viewer )