This is the 2817th most frequent Spanish word.
piedras
Stones.
Here, 'piedras' refers to physical objects, solid mineral matter, specifically stones.
Las piedras en el río son suaves.
The stones in the river are smooth.
In this case, 'piedras' still refers to physical stones, but emphasizes their use in an activity or purpose.
Levantar piedras es un buen ejercicio.
Lifting stones is a good exercise.
Here, 'piedras' refers to precious gemstones, emphasizing their value and decorative use.