convulse vs thresh

convulse and thresh both are verbs.

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

As verbs, convulse and thresh are synonyms defined as:

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

convulse (verb)	thresh (verb)
be overcome with laughter	give a thrashing to; beat hard
make someone convulse with laughter	beat the seeds out of a grain
contract involuntarily, as in a spasm	move or stir about violently
cause to contract	move like a flail; thresh about
move or stir about violently
shake uncontrollably