The word "debtor" is often associated with financial obligations and debt. However, there are several synonyms that can be used interchangeably. One such word is "borrower," which refers to someone who has received a loan or credit. "Obligor" is another synonym that emphasizes the legal obligation to repay a debt. "Indebted person" is a more casual term that can also be used to refer to a debtor. "Defaulter" is a more negative or accusatory term used to describe someone who has failed to meet their debt obligations. Overall, these synonyms offer different shades of meaning and can be useful depending on the context in which they are used.