spatial arrangement vs spacing

spatial arrangement and spacing both are nouns.

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

As nouns, spatial arrangement and spacing are synonyms defined as:

spatial arrangement and spacing: the property possessed by an array of things that have space between them

spatial arrangement (noun)	spacing (noun)
the property possessed by an array of things that have space between them	the property possessed by an array of things that have space between them
	the time between occurrences of a repeating event