Marsh hen and Water hen

Marsh hen noun - A coot found in North America.

Water hen is a synonym for marsh hen. In some cases you can use "Water hen" instead a noun phrase "Marsh hen".

Water hen noun - Any of various small aquatic birds of the genus Gallinula distinguished from rails by a frontal shield and a resemblance to domestic hens.

Marsh hen is a synonym for water hen. You can use "Marsh hen" instead a noun phrase "Water hen".