bubble up vs intumesce

bubble up and intumesce both are verbs.

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

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

bubble up and intumesce: move upwards in bubbles, as from the effect of heating; also used metaphorically

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