IOTA vs endowment

IOTA

noun
  • A bank account that earns interest and pays it to a third party, generally a charity; the principal is typically being held in escrow by the accountholder. 

endowment

noun
  • Property or funds invested for the support and benefit of a person or not-for-profit institution. 

  • Something with which a person or thing is endowed. 

  • Endowment assurance or pure endowment. 

  • A ceremony designed to prepare participants for their role in the afterlife. 

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