cimbalom vs dulcimer

cimbalom

noun
  • A type of concert hammered dulcimer used primarily in the music of Eastern Europe. 

dulcimer

noun
  • A stringed instrument, with strings stretched across a sounding board, usually trapezoidal, played by plucking on the strings (traditionally with a quill) or by tapping on them (in the case of the hammer dulcimers). 

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