openness vs spacing

openness and spacing both are nouns.

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

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

openness: without obstructions to passage or view
spacing: the property possessed by an array of things that have space between them

Other hypernyms of openness include spatial arrangement.

openness (noun)	spacing (noun)
characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive	the property possessed by an array of things that have space between them
willingness or readiness to receive (especially impressions or ideas)	the time between occurrences of a repeating event
without obstructions to passage or view