iota vs maravedi

iota

noun
  • A jot; a very small, insignificant quantity. 

  • The ninth letter of the Greek alphabet. 

maravedi

noun
  • A very small quantity or value; the least possible amount. 

  • A former Spanish coin and unit of currency, originally issued in gold but later in silver and copper, discontinued in 1848. 

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