tenseness vs tensity

tenseness and tensity both are nouns.

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

As nouns, tenseness and tensity are synonyms defined as:

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

Other synonyms of tenseness include tautness, tension.

tenseness (noun)	tensity (noun)
the physical condition of being stretched or strained	the physical condition of being stretched or strained
(psychology) a state of mental or emotional strain or suspense