spastic vs spasmodic

spastic is a noun but spasmodic is not a noun.

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

As adjectives, spastic and spasmodic are synonyms defined as:

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

Other synonyms of spastic include convulsive.

spastic (noun)	spasmodic (noun)
a person suffering from spastic paralysis

spastic (adjective)	spasmodic (adjective)
relating to or characterized by spasm	occurring in spells and often abruptly
suffering from spastic paralysis	affected by involuntary jerky muscular contractions; resembling a spasm
affected by involuntary jerky muscular contractions; resembling a spasm