neighbouring vs adjacent

neighbouring and adjacent both are adjectives.

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

As adjectives, neighbouring and adjacent are synonyms defined as:

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

Other synonyms of neighbouring include conterminous, contiguous, neighboring.

neighbouring (adjective)	adjacent (adjective)
having a common boundary or edge; abutting; touching	nearest in space or position; immediately adjoining without intervening space
	having a common boundary or edge; abutting; touching
	near or close to but not necessarily touching