convulse vs convulsion

convulse is not a noun while convulsion is a noun.

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

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

convulse (verb)	convulsion (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