contiguousness vs adjacency

contiguousness and adjacency both are nouns.

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

As nouns, contiguousness and adjacency are synonyms defined as:

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

Other synonyms of contiguousness include contiguity.

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