ambulance vs health centre

ambulance

noun
  • A mobile field hospital. 

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

verb
  • To transport by ambulance. 

health centre

noun
  • A clinic staffed by a group of general practitioners and nurses 

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