excise tax vs impost

excise tax

noun
  • Any of various taxes levied on the production or sale of certain goods, especially on luxuries, tobacco, alcohol etc. 

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. 

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