vellication vs muscle spasm

vellication and muscle spasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
vellication	Yes	No	No	No
muscle spasm	Yes	No	No	No

As nouns, muscle spasm is a hypernym of vellication; that is, muscle spasm is a word with a broader meaning than vellication:

vellication: a sudden muscle spasm; especially one caused by a nervous condition
muscle spasm: a painful and involuntary muscular contraction

Other hypernyms of vellication include cramp, spasm.

vellication (noun)	muscle spasm (noun)
a sudden muscle spasm; especially one caused by a nervous condition	a painful and involuntary muscular contraction