agency vs agential

agency is a noun but agential is not a noun.

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

agency (noun)	agential (noun)
to have the ability to produce a particular effect or achieve an end
an administrative unit of government
a business or organization that provides a particular service, especially the mediation of transactions between two parties
the state of serving as an official and authorized delegate or agent
the state of being in action or exerting power

agency (adjective)	agential (adjective)
	of or relating to an agent or agency