writer's cramp vs spasm

writer's cramp and spasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer's cramp	Yes	No	No	No
spasm	Yes	No	No	No

As nouns, spasm is a hypernym of writer's cramp; that is, spasm is a word with a broader meaning than writer's cramp:

writer's cramp: muscular spasms of thumb and forefinger while writing with a pen or pencil
spasm: a painful and involuntary muscular contraction

Other hypernyms of writer's cramp include cramp, muscle spasm.

writer's cramp (noun)	spasm (noun)
muscular spasms of thumb and forefinger while writing with a pen or pencil	(pathology) sudden constriction of a hollow organ (as a blood vessel)
	a painful and involuntary muscular contraction