swirl vs unwind

swirl

noun
  • A twist or coil of something. 

  • The upward rushing of a fish through the water to take the bait. 

  • A whirling eddy. 

verb
  • To be arranged in a twist, spiral or whorl. 

  • To circulate. 

  • To twist or whirl, as an eddy. 

unwind

noun
  • Any mechanism or operation that unwinds something. 

verb
  • To undo something. 

  • To relax; to chill out; to rest and become relieved of stress 

  • To close out a position, especially a complicated position. 

  • To be or become unwound; to be capable of being unwound or untwisted. 

  • To analyse (a call stack) so as to generate a stack trace etc. 

  • To separate (something that is wound up) 

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