convulse vs thresh about

convulse and thresh about both are verbs.

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

As verbs, convulse and thresh about are synonyms defined as:

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

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