pork barrel vs tribute

pork barrel

noun
  • State funds as assigned for local or regional expenditure; especially, central money used for regional projects which are eyecatching or designed to appeal to voters. 

  • A ready supply of income; one's livelihood. 

tribute

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

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

  • Extortion; protection money. 

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

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

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

verb
  • To pay as tribute. 

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