| Rating | Solver | Clue |
|---|---|---|
| PEBBLE | Rounded stone | |
| BOULDER | Large rounded stone | |
| GRAVEL | Small rounded stone | |
| COCKHEAD | The rounded or pointed top of a grinding mill spindle, forming a pivot on which the stone is balanced. | |
| COBBLESTONE | A large pebble; a rounded stone not too large to be handled; a small boulder; -- used for paving streets and for other purposes. | |
| STONE | Concreted earthy or mineral matter; also, any particular mass of such matter; as, a house built of stone; the boy threw a stone; pebbles are rounded stones. | |
| CONGLOMERATE | A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; p... | |
| LAZULI | A mineral of a fine azure-blue color, usually in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodiu... | |