There is also another meaning of “creditor” – namely of a person who gives credence to something; i.e. a believer in something. It is important to point here that the origin of the word is the word “credo”, which means to trust in; to rely on. An antonym is “debtor”.
In practice, the word participates in the legal maxim “Debitor creditoris est debitor creditori creditoris”, used in the Litigation procedures. Literally it means that the debtor of the creditor is also the debtor of the creditor's creditor.