tonus vs tensity

tonus and tensity both are nouns.

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

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

tonus: 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 tonus include tautness, tenseness, tension.

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