Synonyms for boulder
- earth
- gravel
- lava
- metal
- rubble
- slab
- bedrock
- cobblestone
- crag
- crust
- lodge
- mass
- mineral
- ore
- pebble
- promontory
- quarry
- reef
- shelf
- slag
MOST RELEVANT
rock
noun. stone
slab
noun. chunk of solid object
stone
noun. hard piece of earth's surface
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.