role vs heavy

role and heavy both are nouns.

Word	Noun	Adjective	Verb	Adverb
role	Yes	No	No	No
heavy	Yes	Yes	No	Yes

As nouns, heavy is a hyponym of role; that is, heavy is a word with a more specific, narrower meaning than role:

Other hyponyms of role include bit part, minor role, hero, ingenue, name part, title role, heroine, baddie, villain.

role (noun)	heavy (noun)
the actions and activities assigned to or required or expected of a person or group	a serious (or tragic) role in a play
normal or customary activity of a person in a particular social setting	an actor who plays villainous roles
what something is used for
an actor's portrayal of someone in a play

role (adjective)	heavy (adjective)
	of comparatively great physical weight or density
	marked by great psychological weight; weighted down especially with sadness or troubles or weariness
	unusually great in degree or quantity or number
	of the military or industry; using (or being) the heaviest and most powerful armaments or weapons or equipment
	(physics, chemistry) being or containing an isotope with greater than average atomic mass or weight
	of great intensity or power or force
	darkened by clouds
	(used of soil) compact and fine-grained
	(of sleep) deep and complete
	lacking lightness or liveliness
	characterized by effort to the point of exhaustion; especially physical effort
	usually describes a large person who is fat but has a large frame to carry it
	full of; bearing great weight
	full and loud and deep
	large and powerful; especially designed for heavy loads or rough work
	slow and laborious because of weight
	of great gravity or crucial import; requiring serious thought
	dense or inadequately leavened and hence likely to cause distress in the alimentary canal
	given to excessive indulgence of bodily appetites especially for intoxicating liquors
	in an advanced stage of pregnancy
	sharply inclined
	made of fabric having considerable thickness
	(of an actor or role) being or playing the villain
	requiring or showing effort
	permitting little if any light to pass through because of denseness of matter
	prodigious
	of relatively large extent and density

role (adverb)	heavy (adverb)
	slowly as if burdened by much weight