infirmary vs teaching hospital

infirmary

noun
  • A clinic or dispensary within another institution. 

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

teaching hospital

noun
  • A hospital in which trainee doctors obtain practical training and experience. 

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