gibber vs tailings

gibber

noun
  • A stone or rock, of chalcedony or similar mineral, found strewn over arid regions of inland Australia; a gibber stone. 

  • Gibberish, unintelligible speech. 

  • A balky horse. 

verb
  • To jabber, talk rapidly and unintelligibly or incoherently. 

tailings

noun
  • The waste that remains after the minerals have been extracted from an ore by ore dressing. 

  • The feints, the last fraction of product obtained at the end of distillation. 

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