mug up vs swot

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

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

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

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

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

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