acquiescence vs passivity

acquiescence

noun
  • Inaction, passivity, or neglect to take legal action when it is called for in order to assert, preserve, or safeguard a right, and which inaction implies the abandonment of said right. 

  • A silent or passive assent or submission, or a submission with apparent content, distinguished from avowed consent on the one hand, and on the other, from opposition or open discontent; quiet satisfaction. 

passivity

noun
  • The state of being passive. 

  • A lack of initiative. 

  • Submissiveness. 

How often have the words acquiescence and passivity occurred in a corpus of books? (source: Google Ngram Viewer )