Final answer:
An antonym for 'Liability' is 'Asset,' meaning a valuable possession, while synonyms include 'Obligation' or 'Responsibility,' indicating a bound duty.
Step-by-step explanation:
An antonym for the word Liability is Asset, which represents something valuable that an individual or entity owns, whereas a liability is something that one is responsible for, typically a debt or obligation. A synonym for liability, on the other hand, could be Obligation or Responsibility, indicating something that a person is bound to by law or duty to deal with or take care of.