intertidal zone vs waterfront

intertidal zone

noun
  • The part of a shore between high water and low water, especially the beach exposed at maximum ebb spring tides. 

waterfront

noun
  • The land alongside a body of water. 

  • The dockland district of a town. 

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