grain elevator vs granary

grain elevator

noun
  • A large structure for the storage of grain. It is more specialized than a regular granary in that in uses an elevating mechanism to hold the grain in one of many different bins, and that it it designed to fill large trucks and train cars for shipping grain in bulk. 

granary

noun
  • A storage facility for grain or sometimes animal feed. 

  • A fertile, grain-growing region. 

How often have the words grain elevator and granary occurred in a corpus of books? (source: Google Ngram Viewer )