hypertonia vs hypertonus

hypertonia and hypertonus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypertonia	Yes	No	No	No
hypertonus	Yes	No	No	No

As nouns, hypertonia and hypertonus are synonyms defined as:

hypertonia and hypertonus: (of muscular tissue) the state of being hypertonic

Other synonyms of hypertonia include hypertonicity.

hypertonia (noun)	hypertonus (noun)
(of muscular tissue) the state of being hypertonic	(of muscular tissue) the state of being hypertonic