docent vs terp

docent

noun
  • A teacher or lecturer at some universities (in central Europe, etc.) 

  • A tour guide at a museum, art gallery, historical site, etc. 

adj
  • Instructive; that teaches. 

terp

noun
  • An interpreter (person who translates). 

  • An interpreter (program that parses and executes another program). 

  • An artificial dwelling mound found on the North European Plain, created to provide safe ground during storm surges, high tides and sea or river flooding. 

  • Any of various essential oils containing monoterpene alcohols which are added to a henna mix to darken the color. 

verb
  • To add such an essential oil to (a henna mix). 

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