air cushion vs dampener

air cushion

noun
  • A shock absorber that uses an air chamber. 

  • A layer of trapped air that supports a hovercraft. 

  • A rubber or plastic inflatable cushion. 

dampener

noun
  • A device that moistens or dampens something. 

  • A discouraging event or remark. 

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