CASE vs suction cup

CASE

noun
  • coatings, adhesives, sealants and elastomers. 

  • computer-aided software engineering. 

suction cup

noun
  • A cup made of flexible material, such as rubber, that uses suction as an adhesive. 

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