controversial vs contentious

controversial and contentious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
controversial	No	Yes	No	No
contentious	No	Yes	No	No

controversial (adjective)	contentious (adjective)
marked by or capable of arousing controversy	inclined or showing an inclination to dispute or disagree, even to engage in law suits
	involving or likely to cause controversy