press vs convulse

press is a noun but convulse is not a noun.

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

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

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

press (noun)	convulse (noun)
the act of pressing; the exertion of pressure
a weightlift in which the barbell is lifted to shoulder height and then smoothly lifted overhead
any machine that exerts pressure to form or shape or cut materials or extract liquids or compress solids
a machine used for printing
a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
clamp to prevent wooden rackets from warping when not in use
the print media responsible for gathering and publishing news in the form of newspapers or magazines
a dense crowd of people
the state of demanding notice or attention

press (verb)	convulse (verb)
force or impel in an indicated direction	be overcome with laughter
ask for or request earnestly	make someone convulse with laughter
lift weights	contract involuntarily, as in a spasm
exert pressure or force to or upon	cause to contract
place between two surfaces and apply weight or pressure	move or stir about violently
squeeze or press together	shake uncontrollably
press and smooth with a heated iron
make strenuous pushing movements during birth to expel the baby
press from a plastic
create by pressing
crowd closely
exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
be urgent
to be oppressive or burdensome