immortality vs impermanence

immortality

noun
  • Never dying 

  • Being remembered forever 

impermanence

noun
  • Lack of permanence or continued duration. 

  • The quality or state of being impermanent. 

  • Anicca, the doctrine which asserts that all of conditioned existence is transient. 

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