Debtors- Debtors refer to people who owe money to the firm on account of goods sold to them on credit. In other words, debtors are customers or purchasers who have purchased the goods from the firm on credit. However, this does not include loans and advances granted by the firm to someone.

Creditors - A person to whom the firm owes money due to the purchase of goods on credit from them is called as a creditor. So, creditors are the suppliers from whom business may have purchased the goods on credit. The term Creditors does not include any loans and advances taken or availed by the firm. If the business or the firm has taken some loan from the bank, then the bank would not be considered as a creditor of the firm.

The terms Sundry Debtors and Sundry Creditors are not defined clearly.

Sometimes,

The term Sundry Debtors is used to refer to sum total of all debtors and the term Sundry Creditors is used to refer to sum total of all creditors

And sometimes, the term Sundry Debtors is used to refer to sum total of small (miscellaneous) debtors and the term Sundry Creditors are used to refer to sum total of small (miscellaneous) creditors.