impost vs pork barrel

impost

noun
  • A tax, tariff or duty that is imposed, especially on merchandise. 

  • The weight that must be carried by a horse in a race, the handicap. 

  • The top part of a column, pillar, pier, wall, etc. that supports an arch. 

pork barrel

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

  • 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. 

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