inflood vs inundation

inflood

noun
  • The act or process of flooding or flowing in; an inflow or influx. 

verb
  • Of a river, water, etc.: to flood or flow into (a place). 

  • To flood or flow in; to inflow. 

inundation

noun
  • The act of inundating; an overflow; a flood; a rising and spreading of water over grounds. 

  • The state of being inundated; flooding 

  • An overflowing or superfluous abundance; a flood; a great influx 

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