convulsive vs spasmodic

convulsive and spasmodic both are adjectives.

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

As adjectives, convulsive and spasmodic are synonyms defined as:

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

Other synonyms of convulsive include spastic.

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