mutable vs revocable

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. 

revocable

adj
  • Having the ability of being revoked; capable of being revoked. 

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