convulse vs laugh

convulse is not a noun while laugh is a noun.

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

As verbs, laugh is a hypernym of convulse; that is, laugh is a word with a broader meaning than convulse:

Other hypernyms of convulse include express joy, express mirth.

convulse (noun)	laugh (noun)
	the sound of laughing
	a humorous anecdote or remark intended to provoke laughter
	a facial expression characteristic of a person laughing

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