cram vs bone

cram is not a noun while bone is a noun.

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

As verbs, cram and bone are synonyms defined as:

Other synonyms of cram include bone up, drum, get up, grind away, mug up, swot, swot up.

cram (noun)	bone (noun)
	a shade of white the color of bleached bones
	rigid connective tissue that makes up the skeleton of vertebrates
	the porous calcified substance from which bones are made

cram (adjective)	bone (adjective)
	consisting of or made up of bone

cram (verb)	bone (verb)
prepare (students) hastily for an impending exam	remove the bones from
study intensively, as before an exam	study intensively, as before an exam
crowd or pack to capacity
put something somewhere so that the space is completely filled