high tide vs menstruation

high tide

noun
  • Synonym of menstruation 

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

  • climax, culminating point or phase 

  • The time of day when the sea has risen to its highest level. 

menstruation

noun
  • An instance of menstruation, the part of each month during which a fertile woman menstruates. 

  • The periodic discharging of the menses, the flow of blood and cells from the lining of the uterus in unfertilized females of humans and other primates. 

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