leeway vs wiggle room

leeway

noun
  • An adverse discrepancy or variation in a cumulative process, usually in the phrase make up leeway. 

  • The drift of a ship or aeroplane in a leeward direction. 

  • A varying degree or amount of freedom or flexibility. 

wiggle room

noun
  • The opportunity to make alternative decisions or to pursue other courses of action, especially any involving only minor changes to one's present situation or course. 

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