observe vs offend

observe

verb
  • To comment on something; to make an observation. 

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

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

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

offend

verb
  • To feel or become offended; to take insult. 

  • To transgress or violate a law or moral requirement. 

  • To hurt the feelings of; to displease; to make angry; to insult. 

  • To physically harm, pain. 

  • To annoy, cause discomfort or resent. 

  • To sin, transgress divine law or moral rules. 

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