predicament vs vicissitude

predicament

noun
  • An unfortunate or trying position or condition. 

  • A definite class, state or condition. 

  • That which is predicated; a category. 

vicissitude

noun
  • A change, especially in one's life or fortunes. 

  • Regular change or succession from one thing to another, or one part of a cycle to the next; alternation; mutual succession; interchange. 

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