tautness vs tensity

tautness and tensity both are nouns.

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

As nouns, tautness and tensity are synonyms defined as:

tautness and tensity: the physical condition of being stretched or strained

Other synonyms of tautness include tenseness, tension.

tautness (noun)	tensity (noun)
lack of movement or room for movement	the physical condition of being stretched or strained
the physical condition of being stretched or strained