excise vs retain

excise

noun
  • A tax charged on goods produced within the country (as opposed to customs duties, charged on goods from outside the country). 

verb
  • To impose an excise tax on something. 

  • To cut out; to remove. 

retain

verb
  • To employ by paying a retainer. 

  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To keep in one's pay or service. 

  • To keep in possession or use. 

  • To hold secure. 

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