water's edge vs wharf

water's edge

noun
  • The edge of any body of water, such as a lake or sea. 

wharf

noun
  • The bank of a river, or the shore of the sea. 

  • A man-made landing place for ships on a shore or river bank. 

verb
  • To place on a wharf. 

  • To secure by a wharf. 

How often have the words water's edge and wharf occurred in a corpus of books? (source: Google Ngram Viewer )