observe vs regard

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). 

regard

verb
  • To look at; to observe. 

  • To consider, look upon (something) in a given way etc. 

  • To have to do with, to concern. 

  • To face toward. 

noun
  • A particular aspect or detail; respect, sense. 

  • The worth or estimation in which something or someone is held. 

  • A steady look, a gaze. 

  • Slang for retard, a very bad stock trader. 

  • One's concern for another; esteem; relation, reference. 

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