spasmodic vs convulsive

spasmodic and convulsive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
spasmodic	No	Yes	No	No
convulsive	No	Yes	No	No

As adjectives, spasmodic and convulsive are synonyms defined as:

spasmodic and convulsive: affected by involuntary jerky muscular contractions; resembling a spasm

Other synonyms of spasmodic include spastic.

spasmodic (adjective)	convulsive (adjective)
occurring in spells and often abruptly	affected by involuntary jerky muscular contractions; resembling a spasm
affected by involuntary jerky muscular contractions; resembling a spasm	resembling a convulsion in being sudden and violent