involve vs untwine

involve

verb
  • To envelop, enfold, entangle. 

  • To take in; to gather in; to mingle, blend or merge. 

  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

untwine

verb
  • To untwist the strands of (something entwined). 

  • To free (one thing that is entwined with another), disentangle, extricate. 

  • To become untwisted or disentangled. 

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