rotary vs whirligig

rotary

noun
  • A roundabout, traffic circle. 

  • Any of the clubs making up the international Rotary International movement for community service. 

adj
  • Capable of rotation. 

  • A rotary engine revolves the heads rather than having pistons go back and forth. 

whirligig

noun
  • A whirligig beetle. 

  • A device incorporating spinning, wind-driven propellers or pinwheels, used as whimsical outdoor decoration in a garden or on a porch. 

  • Anything that whirls or spins around, such as a toy top or a merry-go-round. 

  • A device for punishing prisoners, comprising a wooden cage that rapidly spins around to induce nausea. 

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