hypertonicity vs hypertonus

hypertonicity and hypertonus both are nouns.

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

As nouns, hypertonicity and hypertonus are synonyms defined as:

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

Other synonyms of hypertonicity include hypertonia.

hypertonicity (noun)	hypertonus (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