Debtor

n. one who owes money, one who is obliged to another; company that owes money

Debtor1. Respectively, a person who owes a debt and a person to whom the debt is owed.Usually the debtor has received something from the creditor, in return for which the debtor has promised to make repayment at a later time. If the debtor fails to repay by the deadline, a formal collection process may commence. It is sometimes possible to attach the debtor's property, wages, or bank account as a means of forcing payment. Imprisonment of the debtor is a practice no longer followed. See also garnishment, lien. Source: http://www.britannica.com/ebc/article-9362386
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Noun
1. a person who owes a creditor; someone who has the obligation of paying a debt
(antonym) creditor
(hypernym) person, individual, someone, somebody, mortal, human, soul
(hyponym) defaulter, deadbeat

(n.)
One who owes a debt; one who is indebted; -- correlative to creditor.
  

Borrower of money.