tonicity vs tensity

tonicity and tensity both are nouns.

Word	Noun	Adjective	Verb	Adverb
tonicity	Yes	No	No	No
tensity	Yes	No	No	No

As nouns, tensity is a hypernym of tonicity; that is, tensity is a word with a broader meaning than tonicity:

tonicity: the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli
tensity: the physical condition of being stretched or strained

Other hypernyms of tonicity include tautness, tenseness, tension.

tonicity (noun)	tensity (noun)
the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli	the physical condition of being stretched or strained