self-control vs self-possession

self-control

noun

  • The ability to control one's desires and impulses; willpower. 

verb

  • To control oneself or itself. 

self-possession

noun

  • confidence in one's own powers 

  • calmness and composure, especially when under stress 

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