gaper vs seeing glass

gaper

noun
  • The fish Champsodon capensis 

  • The comber, a fish of the species Serranus cabrilla. 

  • Any of several species of burrowing clams. 

  • An inexperienced skier. 

  • One who gapes; a starer. 

seeing glass

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