approval vs tribute

approval

noun
  • An expression of favorable acceptance and encouragement; a compliment that also condones. 

  • Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item. 

  • An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements. 

tribute

noun
  • An acknowledgment of gratitude, respect or admiration; an accompanying gift. 

  • A certain proportion of the mined ore, or of its value, given to the miner as payment. 

  • A payment made by one nation to another in submission. 

  • Extortion; protection money. 

  • An homage made in a body of work to another work or creator. 

  • A payment made by a feudal vassal to his lord. 

verb
  • To pay as tribute. 

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