1) Arroyo 2) Bourn 3) Brook 4) Creek 5) Rill 6) Runnel 7) Stream 8) Streamlet 9) Watercourse 10) Waterway 1) Brook 2) French word used in English 3) Rill 4) Runnel 5) Small stream 6) Small stream or brook 7) Stream 8) Streamlet 9) Watercourse 
• (n.) A small stream or brook; a streamlet.
Caterpillar species. Latin name: Perizoma affinitata Red campion Description: Pinkish-white, dark brown prothoracic plate. Most of Britain.
Riv'u·let noun [ Earlier rivolet , Italian rivoletto , a dim. from rivolo , Latin rivulus , dim. of rivus a brook. CF. Rival , Rite .] A small stream or brook; a streamlet. « By fountain or by shady rivulet He sought them.» M...
[n] - a small stream
rill noun a small stream
a very small stream
[Literary terms] a small stream