inquisitorial vs inquisitor

inquisitorial is not a noun while inquisitor is a noun.

Word	Noun	Adjective	Verb	Adverb
inquisitorial	No	Yes	No	No
inquisitor	Yes	No	No	No

inquisitorial (noun)	inquisitor (noun)
	a questioner who is excessively harsh

inquisitorial (adjective)	inquisitor (adjective)
especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge
having the authority to conduct official investigations
marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor