「responsibility」:Responsibility may refer to: being in charge, being the owner of a task or event.
「accountability」:In ethics and governance, accountability is answer-ability, blameworthiness, liability, and the expectation of account-giving.
The main difference between responsibility and accountability is that responsibility can be shared while accountability cannot. Being accountable not only means being responsible for something but also ultimately being answerable for your actions. Also, accountability is something you hold a person to only after a task is done or not done. Responsibility can be before and/or after a task.