locomotor vs tractor

locomotor

noun
  • Something that is capable of locomotion. 

adj
  • Of or pertaining to movement or locomotion. 

tractor

noun
  • Any piece of machinery that pulls something. 

  • A vehicle used in farms e.g. for pulling farm equipment and preparing the fields. 

  • A truck (or lorry) for pulling a semi-trailer or trailer. 

  • An aeroplane where the propeller is located in front of the fuselage. 

  • A British Rail Class 37 locomotive. 

  • A movable coop without a floor to allow for free ranging. 

verb
  • To move with a tractor beam. 

  • To prepare (land) with a tractor. 

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