boulder Synonyms

bowlder rock crag stone large mass of stone ballast rock city northwest of denver pebbles rocks Rockingham rock formation stone monument stones glacial erratic gibber stone boulderstone standing stone gemstone rock outcrop bedrock detached mass of rock engage in bouldering flint stones larger rock large marble involvement in bouldering gray rock granitelike rock tor lump lava jewel hunk gravel grain gibber gem escarpment erratic dolmen crystal cromlech column cobblestone cobble megalith menhir metal syenite stonework