ebb and flow vs tidewater

ebb and flow

noun

  • The flowing out and in of the tide. 

  • A large flowing out and in. 

verb

  • To alternately ebb and flow. 

tidewater

noun

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

  • The seaboard. 

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