panorama vs terrain

panorama

noun
  • An unbroken view of an entire surrounding area. 

  • A comprehensive survey. 

  • A picture or series of pictures representing a continuous scene. 

terrain

noun
  • An area of land or the particular features of it. 

  • The surface of the earth; the ground. 

  • A single, distinctive rock formation; an area having a preponderance of a particular rock or group of rocks. 

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