neglect vs observe

neglect

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

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

  • To fail to care for or attend to something. 

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

noun
  • Habitual lack of care. 

  • The act of neglecting. 

  • The state of being neglected. 

observe

verb
  • To notice or view, especially carefully or with attention to detail. 

  • To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning). 

  • To comment on something; to make an observation. 

  • To follow or obey the custom, practice, or rules (especially of a religion). 

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