combust vs erupt

combust and erupt both are verbs.

Word	Noun	Adjective	Verb	Adverb
combust	No	No	Yes	No
erupt	No	No	Yes	No

As verbs, combust and erupt are synonyms defined as:

Other synonyms of combust include catch fire, conflagrate, ignite, take fire.

combust (verb)	erupt (verb)
undergo combustion	become active and spew forth lava and rocks
get very angry and fly into a rage	start abruptly
cause to become violent or angry	erupt or intensify suddenly
start to burn or burst into flames	become raw or open
cause to burn or combust	break out
	appear on the skin
	force out or release suddenly and often violently something pent up
	start to burn or burst into flames