kiosk vs trading post

kiosk

noun
  • A small enclosed structure, often freestanding, open on one side or with a window, used as a booth to sell newspapers, cigarettes, etc. 

  • A public telephone booth. 

  • A Turkish garden pavilion. 

  • A similar unattended stand for the automatic dispensing of tickets, etc. 

trading post

noun
  • A place where trading of goods takes place. 

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