grind away vs cram

grind away and cram both are verbs.

Word	Noun	Adjective	Verb	Adverb
grind away	No	No	Yes	No
cram	No	No	Yes	No

As verbs, grind away and cram are synonyms defined as:

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

grind away (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