compress vs convulse

compress is a noun but convulse is not a noun.

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

As verbs, convulse is a hyponym of compress; that is, convulse is a word with a more specific, narrower meaning than compress:

Other hyponyms of compress include choke, strangle, prim, astringe, strangulate, bear down, overbear, choke, fret, gag, choke, scrag.

compress (noun)	convulse (noun)
a cloth pad or dressing (with or without medication) applied firmly to some part of the body (to relieve discomfort or reduce fever)

compress (verb)	convulse (verb)
squeeze or press together	be overcome with laughter
make more compact by or as if by pressing	make someone convulse with laughter
	contract involuntarily, as in a spasm
	cause to contract
	move or stir about violently
	shake uncontrollably