hypertonicity vs hypertonia

hypertonicity and hypertonia both are nouns.

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

As nouns, hypertonicity and hypertonia are synonyms defined as:

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

Other synonyms of hypertonicity include hypertonus.

hypertonicity (noun)	hypertonia (noun)
(of muscular tissue) the state of being hypertonic	(of muscular tissue) the state of being hypertonic
(of a solution) the extent to which a solution has a higher osmotic pressure than some other