mutable vs quicksilver

mutable

adj
  • Changeable, dynamic, evolutive; inclined to change, evolve, mutate. 

  • Having a value that is changeable during program execution. 

  • Being one of the signs Gemini, Virgo, Sagittarius and Pisces, associated with adaptability, flexibility and sympathy. 

noun
  • Something mutable; a variable or value that can change. 

quicksilver

adj
  • Unpredictable, erratic or fickle; mercurial. 

verb
  • To overlay with quicksilver. 

  • To treat with quicksilver. 

noun
  • The metal mercury. 

  • An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering. 

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