Synonyms for Pothole:

n.

blowhole, cranny, chink, channel, abyss, crater, aperture, cavity, cleft. chasm, gully, ditch, crevice, cave, rift, cavern, crevasse, fissure. chuckhole (noun)
cavity, crater.
pothole (noun)
chuckhole.

Other synonyms:

cavern, cave, crevasse. chasm, gully. ditch. channel. Other relevant words:
cavity, chasm, cavern, channel, chuckhole, cave, ditch, crater.