adjacent vs nigh

adjacent and nigh both are adjectives.

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

adjacent (adjective)	nigh (adjective)
nearest in space or position; immediately adjoining without intervening space	not far distant in time or space or degree or circumstances
having a common boundary or edge; abutting; touching	being on the left side
near or close to but not necessarily touching

adjacent (adverb)	nigh (adverb)
	near in time or place or relationship
	(of actions or states) slightly short of or not quite accomplished; all but