Duty
Part of speech: noun
Definition: That which one is morally or legally obligated to do. A period of time spent at work or doing a particular task. describing a workload as to its idle, working and de-energized periods. A tax placed on imports or exports; a tariff. One's due, something one is owed; a debt or fee.
Responsibility
Part of speech: noun
Definition: The state of being responsible, accountable, or answerable.A duty, obligation or liability for which someone is held accountable.The obligation to carry forward an assigned task to a successful conclusion. With responsibility goes authority to direct and take the necessary action to ensure success. (JP 1-02 Department of Defense Dictionary of Military and Associated Terms).The obligation for the proper custody, care, and safekeeping of property or funds entrusted to the possession or supervision of an individual. (JP 1-02 Department of Defense Dictionary of Military and Associated Terms).