chemist's vs dispensary

chemist's

noun
  • Synonym of pharmacy, especially when run as a small standalone general store. 

dispensary

noun
  • A retail establishment that sells marijuana and related supplies to customers with a prescription to use it for medical purposes. 

  • An institution that dispenses medical supplies and advice. 

How often have the words chemist's and dispensary occurred in a corpus of books? (source: Google Ngram Viewer )