convulse vs toss

convulse is not a noun while toss is a noun.

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

As verbs, convulse and toss are synonyms defined as:

Other synonyms of convulse include jactitate, slash, thrash, thrash about, thresh, thresh about.

convulse (noun)	toss (noun)
	(sports) the act of throwing the ball to another member of your team
	the act of flipping a coin
	an abrupt movement

convulse (verb)	toss (verb)
be overcome with laughter	agitate
make someone convulse with laughter	throw or toss with a light motion
contract involuntarily, as in a spasm	throw carelessly
cause to contract	lightly throw to see which side comes up
move or stir about violently	move or stir about violently
shake uncontrollably	throw or cast away