spacing vs distribution

spacing and distribution both are nouns.

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

As nouns, distribution is a hyponym of spacing; that is, distribution is a word with a more specific, narrower meaning than spacing:

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

Other hyponyms of spacing include openness, distance, dispersion, compactness, concentration, denseness, density, tightness.

spacing (noun)	distribution (noun)
the property possessed by an array of things that have space between them	the act of distributing or spreading or apportioning
the time between occurrences of a repeating event	the commercial activity of transporting and selling goods from a producer to a consumer
	the spatial or geographic property of being scattered about over a range, area, or volume
	(statistics) an arrangement of values of a variable showing their observed or theoretical frequency of occurrence