florist vs florist's

florist

noun
  • A florist's shop. 

  • A person who studies or writes about flowers. 

  • A person who cultivates flowers. 

  • A person who sells flowers. 

florist's

noun
  • A shop that sells flowers, a flower shop. 

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