WordNet sense 1 (having a common boundary or edge; touching):

adjoining, conterminous, contiguous, abutting, neighboring

WordNet sense 2 (joined or linked together):

connected

WordNet sense 3 (nearest in space or position; immediately adjoining without intervening space):

next, side by side

WordNet sense 4 (at or within a short distance in space or time or having elements near each other):

close

WordNet sense 5 (not far distant in time or space or degree or circumstances):

near