beanbag vs booster cushion

beanbag

noun
  • A piece of soft furniture consisting of a leather or vinyl covering stuffed with dry beans or other similar pellets. 

  • A type of juggling ball usually made from leather or cloth stuffed with dry beans. 

  • A small cloth bag filled with dry beans, used as a toy or for exercising the hands. 

  • An idiot. 

  • A testicle. 

booster cushion

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