swot vs swot up

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

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

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

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

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

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