ambulance vs automobile

ambulance

noun
  • An emergency vehicle designed for transporting seriously ill or injured people to a hospital. 

  • A mobile field hospital. 

verb
  • To transport by ambulance. 

automobile

noun
  • A type of vehicle designed to move on the ground under its own stored power and intended to carry a driver, a small number of additional passengers, and a very limited amount of other load. A car or motorcar. 

adj
  • Self-moving; self-propelled. 

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