flare up vs erupt

flare up and erupt both are verbs.

Word	Noun	Adjective	Verb	Adverb
flare up	No	No	Yes	No
erupt	No	No	Yes	No

As verbs, flare up and erupt are synonyms defined as:

Other synonyms of flare up include break open, burst out, flare, irrupt.

flare up (verb)	erupt (verb)
erupt or intensify suddenly	become active and spew forth lava and rocks
ignite quickly and suddenly, especially after having died down	start abruptly
	erupt or intensify suddenly
	become raw or open
	break out
	appear on the skin
	force out or release suddenly and often violently something pent up
	start to burn or burst into flames