density vs spatial arrangement

density and spatial arrangement both are nouns.

Word	Noun	Adjective	Verb	Adverb
density	Yes	No	No	No
spatial arrangement	Yes	No	No	No

As nouns, spatial arrangement is a hypernym of density; that is, spatial arrangement is a word with a broader meaning than density:

density: the spatial property of being crowded together
spatial arrangement: the property possessed by an array of things that have space between them

Other hypernyms of density include spacing.

density (noun)	spatial arrangement (noun)
the amount per unit size	the property possessed by an array of things that have space between them
the spatial property of being crowded together