disarticulate vs unravel

disarticulate

verb
  • To disjoint. 

  • To amputate (a limb) at a joint without cutting the bone. 

unravel

verb
  • To become undone; to collapse. 

  • To separate the threads (of); disentangle. 

  • To become separated; (of something woven, knitted, etc.) to come apart. 

  • To separate the connected or united parts of; to throw into disorder; to confuse. 

  • To clear from complication or difficulty; to unfold; to solve. 

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