whirligig vs wind generator

whirligig

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

  • A whirligig beetle. 

  • 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. 

wind generator

noun
  • a wind-driven generator, working on the same principle as a wind turbine but usually on a smaller scale, used for example for charging batteries on sailing boats. 

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