Marsh hen and Swamphen

Marsh 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.

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

Swamphen 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 swamphen. You can use "Marsh hen" instead a noun "Swamphen".