contiguity vs contiguous

contiguity is a noun but contiguous is not a noun.

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

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

contiguity (adjective)	contiguous (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