ego vs self-centeredness

ego

noun
  • The self, especially with a sense of self-importance. 

  • The most central part of the mind, which mediates with one's surroundings. 

self-centeredness

noun
  • The state, quality, or condition of being self-centered; concern only for oneself 

How often have the words ego and self-centeredness occurred in a corpus of books? (source: Google Ngram Viewer )