convulsion vs convulse

convulsion is a noun but convulse is not a noun.

Word	Noun	Adjective	Verb	Adverb
convulsion	Yes	No	No	No
convulse	No	No	Yes	No

convulsion (noun)	convulse (noun)
a physical disturbance such as an earthquake or upheaval
violent uncontrollable contractions of muscles
a sudden uncontrollable attack
a violent disturbance

convulsion (verb)	convulse (verb)
	be overcome with laughter
	make someone convulse with laughter
	contract involuntarily, as in a spasm
	cause to contract
	move or stir about violently
	shake uncontrollably