hern vs terrain

hern

noun
  • A corner of angular piece of land; a nook of land projecting into another district, parish, or field. 

  • Heron. 

  • Corner, nook. 

  • A recess beside a wide chimney-fireside. 

pron
  • Hers; her own. 

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 hern and terrain occurred in a corpus of books? (source: Google Ngram Viewer )