adjacent vs neighboring

adjacent and neighboring both are adjectives.

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

As adjectives, adjacent and neighboring are synonyms defined as:

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

Other synonyms of adjacent include conterminous, contiguous, neighbouring.

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