egoism vs extroversion

egoism

noun
  • Egotism (tendency to talk excessively about oneself). 

  • The tendency to think selfishly with exclusive self-interest in mind. 

  • The belief that moral behavior should be directed toward one's self-interest only. 

extroversion

noun
  • A personality orientation towards others and things outside oneself; behavior expressing such orientation. 

  • The condition of being inside out, especially in relation to the bladder. 

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