tidal wave vs tidewater

tidal wave

noun
  • A crest of ocean water resulting from tidal forces. 

  • A large, sudden, and disastrous wave of water caused by a tremendous disturbance in the ocean; a tsunami. (See Usage notes below.) 

  • A sudden and powerful surge. 

  • A large, sudden inundation of water from the storm surge, or waves of that surge; a sudden surge of river water. 

  • A large and sudden rise and fall in the tide. 

tidewater

noun
  • Water affected by the flow of the tide, especially tidal streams. 

  • The seaboard. 

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