capsize vs keel over

capsize

verb
  • To cause (a ship) to overturn. 

  • To overturn. 

  • To deform under stress. 

noun
  • The act of, or occurrence of capsizing or overturning. 

keel over

verb
  • Of a vessel: to roll so far on its side that it cannot recover; to capsize or turn turtle. 

  • To collapse in a faint; to black out, to swoon. 

  • To die. 

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