agent vs agency

agent and agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
agent	Yes	No	No	No
agency	Yes	No	No	No

agent (noun)	agency (noun)
the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause	to have the ability to produce a particular effect or achieve an end
an active and efficient cause; capable of producing a certain effect	an administrative unit of government
a businessman who buys or sells for another in exchange for a commission	a business or organization that provides a particular service, especially the mediation of transactions between two parties
a representative who acts on behalf of other persons or organizations	the state of serving as an official and authorized delegate or agent
any agent or representative of a federal agency or bureau	the state of being in action or exerting power
a substance that exerts some force or effect