mullock vs potlatch

mullock

noun
  • Tailings: waste rock from which the wanted gold, minerals, opal, etc., has been extracted. 

  • Rubbish, waste matter. 

  • Nonsense, rubbish. 

  • A mess; the result of a blunder. 

  • Overburden: waste material generated while searching for minerals or while mining, such as when sinking a shaft. 

verb
  • To clear waste material out of a mine. 

potlatch

noun
  • A ceremony amongst certain indigenous peoples of the Pacific Northwest in which gifts are bestowed upon guests and personal property is destroyed in a show of generosity and wealth. 

  • A communal meal to which guests bring dishes to share; a potluck. 

verb
  • To carry out or take part in a potlatch ceremony. 

  • To give; especially, to give as a gift during a potlatch ceremony. 

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