debt vs invoice

debt

noun
  • Money that one person or entity owes or is required to pay to another, generally as a result of a loan or other financial transaction. 

  • An action, state of mind, or object one has an obligation to perform for another, adopt toward another, or give to another. 

  • The state or condition of owing something to another. 

  • An action at law to recover a certain specified sum of money alleged to be due 

invoice

noun
  • A bill; a commercial document issued by a seller to a buyer indicating the products, quantities and agreed prices for products or services that the seller has already provided the buyer with. An invoice indicates that, unless paid in advance, payment is due by the buyer to the seller, according to the agreed terms. 

  • The lot or set of goods as shipped or received. 

  • The price which a seller or dealer pays the manufacturer for goods to be sold. 

verb
  • To bill; to issue an invoice to. 

  • To make an invoice for (goods or services). 

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