bulk vs bulky

bulk is a noun but bulky is not a noun.

Word	Noun	Adjective	Verb	Adverb
bulk	Yes	No	Yes	No
bulky	No	Yes	No	No

bulk (noun)	bulky (noun)
the property of something that is great in magnitude
the property resulting from being or relating to the greater in number of two parts; the main part
the property possessed by a large mass

bulk (adjective)	bulky (adjective)
	of large size for its weight

bulk (verb)	bulky (verb)
cause to bulge or swell outwards
stick out or up
to gain size and weight by means of exercise and diet