intrusion vs inundation

intrusion

noun
  • The forcible inclusion or entry of an external group or individual; the act of intruding. 

  • The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r) 

  • A structure that lies within a historic district but is nonhistoric and irrelevant to the district. 

  • Magma forced into other rock formations; the rock formed when such magma solidifies. 

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 intrusion and inundation occurred in a corpus of books? (source: Google Ngram Viewer )