banknote vs hiaqua

banknote

noun
  • A piece of paper currency. 

  • A promissory note issued by a bank, payable at a given time to a specific beneficiary. 

hiaqua

noun
  • Beads or shells, especially as placed on strings and valued as ornaments or a sort of currency. 

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