mediate vs immediacy

mediate is not a noun while immediacy is a noun.

Word	Noun	Adjective	Verb	Adverb
mediate	No	Yes	Yes	No
immediacy	Yes	No	No	No

mediate (noun)	immediacy (noun)
	the quickness of action or occurrence
	lack of an intervening or mediating agency
	immediate intuitive awareness

mediate (adjective)	immediacy (adjective)
acting through or dependent on an intervening agency
being neither at the beginning nor at the end in a series

mediate (verb)	immediacy (verb)
act between parties with a view to reconciling differences
occupy an intermediate or middle position or form a connecting link or stage between two others