high tide vs hightide

high tide

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

  • Synonym of menstruation 

  • climax, culminating point or phase 

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

hightide

noun
  • The point at which the sea level is at its highest during any given cycle 

  • A great festival. 

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