loudness vs intensity

loudness and intensity both are nouns.

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

As nouns, loudness and intensity are synonyms defined as:

loudness and intensity: the magnitude of sound (usually in a specified direction)

Other synonyms of loudness include volume.

loudness (noun)	intensity (noun)
the magnitude of sound (usually in a specified direction)	high level or degree; the property of being intense
tasteless showiness	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)