self-importance vs smugness

self-importance

noun
  • An exaggerated estimate of one's own importance or merit, especially as manifested by the conduct or manners; self-conceit. 

smugness

noun
  • The state or quality of being smug. 

  • The result or product of being smug. 

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