Robert MacGregor vs criminal

Robert MacGregor and criminal both are nouns.

Word	Noun	Adjective	Verb	Adverb
Robert MacGregor	Yes	No	No	No
criminal	Yes	Yes	No	No

Robert MacGregor (noun)	criminal (noun)
Scottish clan leader and outlaw who was the subject of a 1817 novel by Sir Walter Scott (1671-1734)	someone who has committed a crime or has been legally convicted of a crime

Robert MacGregor (adjective)	criminal (adjective)
	guilty of crime or serious offense
	involving or being or having the nature of a crime
	bringing or deserving severe rebuke or censure