observe vs recognize

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). 

recognize

verb
  • To acknowledge or consider (as being a certain thing or having a certain quality or property). 

  • To match (something or someone which one currently perceives) to a memory of some previous encounter with the same person or thing. 

  • To realize or discover the nature of something; apprehend quality in. 

  • To show formal appreciation of, as with an award, commendation etc. 

  • to cognize again 

  • To have the property to bind to specific antigens. 

  • To acknowledge the existence or legality of; to treat as valid or worthy of consideration. 

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