tightness vs density

tightness and density both are nouns.

Word	Noun	Adjective	Verb	Adverb
tightness	Yes	No	No	No
density	Yes	No	No	No

As nouns, tightness and density are synonyms defined as:

Other synonyms of tightness include compactness, concentration, denseness.

tightness (noun)	density (noun)
lack of movement or room for movement	the amount per unit size
extreme stinginess	the spatial property of being crowded together
the spatial property of being crowded together
a tight feeling in some part of the body
a state occasioned by scarcity of money and a shortage of credit