opportunism vs self-seeking

opportunism

noun
  • The practice of taking advantage of any situations or people to achieve an end, often with no regard for principles or consequences. 

self-seeking

noun
  • The selfish promotion of one's own interests. 

adj
  • Mindful of, or promoting, only one's own interests. 

  • That searches for a target automatically. 

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