boulder (noun) rock: stone
Sinonime: abysm,
alienation,
arroyo,
blank,
breach, cavity, cleavage, cleft, clough, clove, crater, crevasse,
fissure, flume,
gorge, gulch, gulf,
hiatus, hole,
hollow,
omission,
opening,
oversight, preterition,
ravine,
rent, rift, schism,
skip, split,
void, yawn
Antonime: closure,
junction,
juncture