intensiveness vs intensity

intensiveness and intensity both are nouns.

Word	Noun	Adjective	Verb	Adverb
intensiveness	Yes	No	No	No
intensity	Yes	No	No	No

As nouns, intensiveness and intensity are synonyms defined as:

intensiveness and intensity: high level or degree; the property of being intense

intensiveness (noun)	intensity (noun)
high level or degree; the property of being intense	high level or degree; the property of being intense
	chromatic purity: freedom from dilution with white and hence vivid in hue
	the magnitude of sound (usually in a specified direction)
	the amount of energy transmitted (as by acoustic or electromagnetic radiation)