General terms:
* Pebble: This is a common term for a small, smooth rock, often found on beaches or in riverbeds.
* Stone: This is a general term for any rock, but it can also refer to a small rock.
* Rock: This term can be used for any size of rock, but it's usually used for larger rocks.
More specific terms:
* Gravel: This refers to a collection of small, loose rocks, typically smaller than a fist.
* Shard: This term is used for a sharp, broken piece of rock, often from a larger rock.
* Grit: This refers to very small, rough particles of rock, often found in sand.
Other terms:
* Bouldery: This term describes a rock that is large and rounded, often found in glacial environments.
* Cobblestone: This refers to a smooth, rounded rock, typically used for paving roads.
The best term to use will depend on the specific size, shape, and context of the rock.
