neglect vs nonobservance

neglect

noun
  • The act of neglecting. 

  • Habitual lack of care. 

  • The state of being neglected. 

verb
  • To fail to do or carry out something due to oversight or carelessness. 

  • To fail to care for or attend to something. 

  • To omit to notice; to forbear to treat with attention or respect; to slight. 

  • To ignore for the sake of simplifying calculations without significantly affecting accuracy. 

nonobservance

noun
  • The failure to observe a custom, or to conform with a law 

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