A tributary
A stream or river called that flows into a larger stream or river is called a tributary.
It is a small stream that leads into a larger stream. (it is spelled tributary)
Usually a river
Tributary
a stream that empties into a larger river is a Tributary
Tributary
A tributary.
It is called a tributary.
A Tributary.
A tributary.
The smaller stream is a tributary of a larger stream, river or lake.
Tributary.