boulder
/ˈbəʊl.də(ɹ)/noun
A large mass of stone detached from the surrounding land.
Example sentence
- “They climbed the boulder.”
Related words
gravelSmall fragments of rock, used for laying on the beds of roads and railways, and as ballast.cavernA large cave.sandRock that is ground more finely than gravel, but is not as fine as silt (more formally, see grain sizes chart), forming beaches and deserts and also used in construction.caveA large, naturally-occurring cavity formed underground or in the face of a cliff or a hillside.duneA ridge or hill of sand piled up by currents of wind or water.slopeAn area of ground that tends evenly upward or downward.