divergent vs nonidentical

divergent

adj
  • Disagreeing from something given; differing. 

  • Causing divergence of rays. 

  • (said of a sequence or series) Diverging; not approaching a limit. 

  • Growing further apart; diverging. 

nonidentical

adj
  • Not identical; different in some respect. 

noun
  • A twin other than an identical twin. 

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