contiguous vs contiguity

contiguous is not a noun while contiguity is a noun.

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

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

contiguous (adjective)	contiguity (adjective)
very close or connected in space or time
connecting without a break; within a common boundary
having a common boundary or edge; abutting; touching