convulse vs convulsive

convulse is not an adjective while convulsive is an adjective.

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

convulse (adjective)	convulsive (adjective)
	affected by involuntary jerky muscular contractions; resembling a spasm
	resembling a convulsion in being sudden and violent

convulse (verb)	convulsive (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