acromyotonia vs myotonia

acromyotonia and myotonia both are nouns.

Word	Noun	Adjective	Verb	Adverb
acromyotonia	Yes	No	No	No
myotonia	Yes	No	No	No

As nouns, myotonia is a hypernym of acromyotonia; that is, myotonia is a word with a broader meaning than acromyotonia:

acromyotonia: myotonia of the extremities only; causes spastic deformity of the hand or foot
myotonia: abnormally long muscular contractions; slow relaxation of a muscle after a contraction

acromyotonia (noun)	myotonia (noun)
myotonia of the extremities only; causes spastic deformity of the hand or foot	abnormally long muscular contractions; slow relaxation of a muscle after a contraction