heavy vs heavily

heavy is a noun but heavily is not a noun.

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

As adverbs, heavy and heavily are synonyms defined as:

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

heavy (adjective)	heavily (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

heavy (adverb)	heavily (adverb)
slowly as if burdened by much weight	to a considerable degree
	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