Synonyms for Agency (same or very similar meaning)
WordNet sense 1 (the state of serving as an official and authorized delegate or agent):
representation, delegacyWordNet sense 2 (an administrative unit of government):
authority, bureau, office, federal agency, government agencyWordNet sense 3 (how a result is obtained or an end is achieved):
means, wayFrom the ODE community, based on WordNetadd/edit