advice vs recommendation

advice

noun
  • An opinion offered to guide behavior in an effort to be helpful. 

  • A communication providing information, such as how an uncertain area of law might apply to possible future actions 

  • Counseling to perform a specific legal act. 

  • In commercial language, information communicated by letter; used chiefly in reference to drafts or bills of exchange 

  • In language about financial transactions executed by formal documents, an advisory document. 

  • Counseling to perform a specific illegal act. 

  • In aspect-oriented programming, the code whose execution is triggered when a join point is reached. 

recommendation

noun
  • An act of recommending. 

  • A suggestion or proposal about the best course of action (with adpositions including "about" for the context and "to" for the course of action) 

  • That which is recommended. 

  • A commendation or endorsement. 

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