opinion vs thought

opinion

noun
  • A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing. 

  • a judicial opinion delivered by an Advocate General to the European Court of Justice where he or she proposes a legal solution to the cases for which the court is responsible 

  • The formal decision, or expression of views, of a judge, an umpire, a doctor, or other party officially called upon to consider and decide upon a matter or point submitted. 

  • The judgment or sentiment which the mind forms of persons or things; estimation. 

thought

noun
  • A way of thinking (associated with a group, nation or region). 

  • A very small amount, distance, etc.; a whit or jot. 

  • The operation by which mental activity arise or are manipulated; the process of thinking; the agency by which thinking is accomplished. 

  • Anxiety, distress. 

  • Representation created in the mind without the use of one's faculties of vision, sound, smell, touch, or taste; an instance of thinking. 

  • The careful consideration of multiple factors; deliberation. 

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