contiguity vs contiguousness

contiguity and contiguousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
contiguity	Yes	No	No	No
contiguousness	Yes	No	No	No

As nouns, contiguity and contiguousness are synonyms defined as:

contiguity and contiguousness: the attribute of being so near as to be touching

Other synonyms of contiguity include adjacency.

contiguity (noun)	contiguousness (noun)
the attribute of being so near as to be touching	the attribute of being so near as to be touching