ambulance vs infirmary

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. 

infirmary

noun
  • A place where sick or injured people are cared for, especially a small hospital; sickhouse. 

  • A clinic or dispensary within another institution. 

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