egomania vs self-conceit

egomania

noun
  • Excessive vanity, pride or arrogance; self-importance. 

self-conceit

noun
  • Conceit of oneself; an overweening opinion of one's own powers or endowments; vanity. 

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