apart vs riven

apart

adj
  • Having been taken apart; disassembled, in pieces. 

  • Separate, on the side. 

  • Exceptional, distinct. 

adv
  • Aside; away; not included. 

  • separately, exclusively, not together 

  • Placed separately (in regard to space or time). 

  • In or into two or more parts. 

prep
  • Apart from. 

riven

adj
  • Broken into pieces; split asunder. 

  • Torn apart. 

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