swell up vs intumesce

swell up and intumesce both are verbs.

Word	Noun	Adjective	Verb	Adverb
swell up	No	No	Yes	No
intumesce	No	No	Yes	No

As verbs, swell up and intumesce are synonyms defined as:

Other synonyms of swell up include swell, tumefy, tumesce.

swell up (verb)	intumesce (verb)
expand abnormally	expand abnormally
	move upwards in bubbles, as from the effect of heating; also used metaphorically