fibreglass vs tankard

fibreglass

noun
  • A composite material made from fine fibres of spun glass held together with resin. 

  • Silica based glass extruded into fibers that possess a length at least 1000 times greater than their width. 

verb
  • To apply fibreglass to. 

tankard

noun
  • A large drinking vessel, sometimes of pewter, sometimes with a glass base, with one handle and often a hinged cover. 

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