heavily vs heavy

heavily is not a noun while heavy is a noun.

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

As adverbs, heavily and heavy are synonyms defined as:

heavily (noun)	heavy (noun)
	a serious (or tragic) role in a play
	an actor who plays villainous roles

heavily (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

heavily (adverb)	heavy (adverb)
to a considerable degree	slowly as if burdened by much weight
indulging excessively
slowly as if burdened by much weight
in a manner designed for heavy duty
in a heavy-footed manner
with great force
in a labored manner