overcrowd vs submerge

overcrowd

verb
  • To fill beyond reasonable limits, with people, animals, objects or information. 

submerge

verb
  • To engulf or overwhelm. 

  • To sink out of sight. 

  • To put into a liquid; to immerse; to plunge into and keep in. 

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