inundation vs swamping

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 

swamping

noun
  • An act of swamping (drenching or filling with water). 

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