cell division vs fission

cell division

noun
  • a process by which a cell divides into two cells 

fission

noun
  • The process by which a bacterium splits to form two daughter cells. 

  • The process whereby one item splits to become two. 

verb
  • To cause to undergo fission. 

  • To undergo fission. 

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