swot vs bone up

swot is a noun but bone up is not a noun.

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

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

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

swot (noun)	bone up (noun)
an insignificant student who is ridiculed as being affected or boringly studious

swot (verb)	bone up (verb)
study intensively, as before an exam	study intensively, as before an exam