altruism vs egotism

altruism

noun
  • Action or behaviour that benefits another or others at some cost to the performer. 

  • Regard for others, both natural and moral without regard for oneself; devotion to the interests of others; brotherly kindness. 

egotism

noun
  • A belief that one is superior to or more important than others. 

  • The result or product of being egoistic. 

  • Egoism (belief that behavior should be directed towards one's self-interest). 

  • A tendency to talk excessively about oneself. 

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