sleigh vs snowmobile

sleigh

verb
  • To ride or drive a sleigh. 

noun
  • A vehicle, generally pulled by an animal, which moves over snow or ice on runners, used for transporting persons or goods. (contrast "sled", which is smaller) 

snowmobile

verb
  • To ride or race in a snowmobile. 

noun
  • A vehicle with skis at the front and a caterpillar track at the rear, used for travelling over snow, sometimes as sport. 

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