swot vs mug up

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

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

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

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

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

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