The term 'rivulet' suggests the water body is very tiny compared to a river. A rivulet wound its way through the garden, hardly wider than a stride.
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Natural Setting
Rivulets often appear in natural landscapes and are described in nature-scapes. Wildflowers lined the banks of the little rivulet cascading down the hill.
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Descriptive Imagery
Use 'rivulet' to create vivid images, especially in poetic or descriptive writing. Tiny rivulets of rainwater created intricate patterns on the windowpane.