arbitrate vs mediate

arbitrate is not an adjective while mediate is an adjective.

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

As verbs, arbitrate and mediate are synonyms defined as:

arbitrate and mediate: act between parties with a view to reconciling differences

Other synonyms of arbitrate include intercede, intermediate, liaise.

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

arbitrate (verb)	mediate (verb)
act between parties with a view to reconciling differences	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