chemist's vs pharmacist

chemist's

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

pharmacist

noun
  • One who studies pharmacy. 

  • A health professional who controls, formulates, preserves, and dispenses medications and provides medical advice and counseling on how medicines should be used in order to achieve maximum benefit, and minimal side effects in order to avoid drug interactions. 

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