Estuary and Ravine

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

Ravine and estuary are semantically related. In some cases you can use "Ravine" instead a noun "Estuary".

Ravine noun - A narrow opening between hillsides or mountains that can be used for passage.

Estuary and ravine are semantically related. Sometimes you can use "Estuary" instead a noun "Ravine".