stuff vs cram

stuff is a noun but cram is not a noun.

Word	Noun	Adjective	Verb	Adverb
stuff	Yes	No	Yes	No
cram	No	No	Yes	No

As verbs, cram is a hypernym of stuff; that is, cram is a word with a broader meaning than stuff:

As verbs, cram is a hyponym of stuff; that is, cram is a word with a more specific, narrower meaning than stuff:

Other hyponyms of stuff include chock up, jam, jampack, ram, wad, overstuff, fill out, pad.

stuff (noun)	cram (noun)
miscellaneous unspecified objects
unspecified qualities required to do or be something
a critically important or characteristic component
senseless talk
information in some unspecified form
informal terms for personal possessions
the tangible substance that goes into the makeup of a physical object

stuff (verb)	cram (verb)
fill with a stuffing while cooking	prepare (students) hastily for an impending exam
fill tightly with a material	study intensively, as before an exam
treat with grease, fill, and prepare for mounting	crowd or pack to capacity
overeat or eat immodestly; make a pig of oneself	put something somewhere so that the space is completely filled
cram into a cavity
obstruct
press or force