hypertonus vs hypertonia

hypertonus and hypertonia both are nouns.

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

As nouns, hypertonus and hypertonia are synonyms defined as:

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

Other synonyms of hypertonus include hypertonicity.

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