air cushion vs inlay

air cushion

noun
  • A rubber or plastic inflatable cushion. 

  • A shock absorber that uses an air chamber. 

  • A layer of trapped air that supports a hovercraft. 

inlay

noun
  • The material placed within a different material in the form of a decoration. 

  • A filling for a tooth, made of ceramic or gold to fit the cavity and shape of tooth and cemented into place. 

  • The piece of paper or the booklet inside the case of a compact disc, DVD, or cassette. 

verb
  • To place (pieces of a foreign material) within another material to form a decorative design. 

  • To place an inlay in a tooth. 

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