noun

le caillou

pebble · stone

C'est un petit morceau de roche que l'on trouve souvent par terre.

The word "caillou" in French translates to "stone" or "small rock" in English. It refers specifically to a small, often rounded piece of rock or mineral, as opposed to larger rocks or boulders.

Synonyms and Differences:

Pierre: This word means "rock" or "stone" in a more general sense and can refer to both small stones and larger rocks. It is a more formal term and can also be used in various contexts, such as in geology or construction.
Galet: This term refers specifically to a smooth, rounded pebble that has typically been polished by water and time. Galets can be made of various materials and are often found by rivers or beaches.
Gravier: Meaning "gravel," this word refers to multiple small stones or pebbles, typically used for construction, landscaping, or paths. Gravier encompasses a broader category that includes a variety of sizes, from small pebbles to larger gravel chunks.
Roche: Translates to "rock" and refers to solid mineral matter in general, which can include large formations that may contain smaller "cailloux".

While all these words relate to stone or rock, "caillou" is more specific to smaller, individual stones, often loosely lying on the ground, whereas the other synonyms differ in size, context, and usage.