Yes, Bills Payables are creditors too.
By that, both Bills Payables and Accounts Payables will enter your Statement of Financial Position. The difference will be in your Income Statement; Accounts Payables will be included in your calculation for Purchases (in the Trading Account), while Bills Payables will appear as an expense (in the Profit and Loss Account).
In a strictly accounting sense, Accounts Payables refer to your trading activities, and Bills Payables to your operating activities, i.e. all the selling, administrative, and financial expenses incurred to bring about that trade.
I hope it's clearer...
~Good Day