cataract vs landflood

cataract

noun
  • A flood of water. 

  • A clouding of the lens in the eye leading to a decrease in vision. 

  • A large waterfall; steep rapids in a river. 

  • An overwhelming downpour or rush. 

landflood

noun
  • An overflowing of land by river; an inundation or freshet. 

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