Firth and Rivulet

Firth noun - A part of a body of water that extends beyond the general shoreline.

Rivulet and firth are semantically related. in narrow body of water topic. In some cases you can use "Rivulet" instead a noun "Firth".

Rivulet noun - A natural body of running water smaller than a river.

Firth and rivulet are semantically related. Sometimes you can use "Firth" instead a noun "Rivulet".