1. silo in general: a generally cylindrical tower used for storing fodder or grain.
  2. tank in general: a fixed structure for storing liquids. (IHO Dictionary, S-32, 5th Edition, 5290)
  3. grain elevator: a storage building for grain. Usually a tall frame, metal or concrete structure with an especially compartmented interior. (The New Encyclopaedia Britannica Micropaedia, 15th Edition).
  4. water tower: a tower with an elevated container used to hold water.