dispersion vs spacing

dispersion and spacing both are nouns.

Word	Noun	Adjective	Verb	Adverb
dispersion	Yes	No	No	No
spacing	Yes	No	No	No

As nouns, spacing is a hypernym of dispersion; that is, spacing is a word with a broader meaning than dispersion:

dispersion: the spatial or geographic property of being scattered about over a range, area, or volume
spacing: the property possessed by an array of things that have space between them

Other hypernyms of dispersion include spatial arrangement.

dispersion (noun)	spacing (noun)
the act of dispersing or diffusing something	the property possessed by an array of things that have space between them
the spatial or geographic property of being scattered about over a range, area, or volume	the time between occurrences of a repeating event
spreading widely or driving off