bone up vs cram

bone up and cram both are verbs.

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

As verbs, bone up and cram are synonyms defined as:

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

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