low tide vs waning

low tide

noun
  • The time of day when the sea has receded to its lowest level. 

  • The tide at its lowest level for a particular tidal cycle at a certain place. 

waning

noun
  • The fact or act of becoming less or less intense or present; fading. 

  • The fact or act of becoming smaller. 

adj
  • Becoming weaker or smaller. 

  • Of the lunar phase: as it shrinks when viewed from the Earth. 

How often have the words low tide and waning occurred in a corpus of books? (source: Google Ngram Viewer )