bell tower vs carillon

bell tower

noun
  • A tower in which a bell (or set of bells) is hung; a belfry. 

carillon

noun
  • A set of bells, often in a bell tower, sometimes operated by means of a keyboard (manual or pedal), originating from the Low Countries. 

  • A tune adapted to be played by musical bells. 

verb
  • To play a carillon. 

  • To ring out like a carillon. 

How often have the words bell tower and carillon occurred in a corpus of books? (source: Google Ngram Viewer )