arbor vs capstan

arbor

noun
  • A spindle of a wheel. 

  • A shady sitting place or pergola usually in a park or garden, surrounded by climbing shrubs, vines or other vegetation. 

  • A grove of trees. 

  • A bar for supporting cutting tools. 

  • An axis or shaft supporting a rotating part on a lathe. 

capstan

noun
  • A vertical cylindrical machine that revolves on a spindle, used to apply force to ropes, cables, etc. It is typically surmounted by a drumhead with sockets for levers used to turn it. 

  • A rotating spindle used to move recording tape through the mechanism of a tape recorder. 

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