arrogate vs arrogator

arrogate is not a noun while arrogator is a noun.

Word	Noun	Adjective	Verb	Adverb
arrogate	No	No	Yes	No
arrogator	Yes	No	No	No

arrogate (noun)	arrogator (noun)
	a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess

arrogate (verb)	arrogator (verb)
seize and take control without authority and possibly with force; take as one's right or possession
make undue claims to having
demand as being one's due or property; assert one's right or title to