chassis vs torso

chassis

noun
  • The base frame of a motor vehicle. 

  • A woman's buttocks. 

  • A base frame, or movable railway, along which the carriage of a mounted gun moves backward and forward. 

  • A frame or housing containing electrical or mechanical equipment, such as on a computer. 

torso

noun
  • The main part of the (human) body that extends from the neck to the groin, excluding the head and limbs. 

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