contiguous vs neighbouring

contiguous and neighbouring both are adjectives.

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

As adjectives, contiguous and neighbouring are synonyms defined as:

contiguous and neighbouring: having a common boundary or edge; abutting; touching

Other synonyms of contiguous include adjacent, conterminous, neighboring.

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