What's the difference between gallinule and swamphen?

Gallinule

Definition:

(n.) One of several wading birds, having long, webless toes, and a frontal shield, belonging to the family Rallidae. They are remarkable for running rapidly over marshes and on floating plants. The purple gallinule of America is Ionornis Martinica, that of the Old World is Porphyrio porphyrio. The common European gallinule (Gallinula chloropus) is also called moor hen, water hen, water rail, moor coot, night bird, and erroneously dabchick. Closely related to it is the Florida gallinule (Gallinula galeata).

Example Sentences:

(1) The mute swan (Cygnus olor), mallard duck (Anas platyrhynchos), common gallinule (Gallinula chloropus), common rhea (Rhea americana), and red-billed hornbill (Tockus erythrorhynchus) were the 5 species most frequently affected of the 1,032 deaths from 1973 through 1983.
(2) But Mohamed is less interested in geology, and is soon pointing out pied kingfishers and the fabulously named squacco heron, the even more fabulous purple gallinule and the improbable Senegal Thick-knee.

Definition:

Example Sentences:

(1) Four cases of malignant neoplasia in captive wild birds are described: an adenocarcinoma of the adrenal gland in a Mountain duck (Tadorna tadornoides), a malignant melanoma in the thoracic cavity of a Combed duck (Sarkidiornis melanotos), a hepatocellular carcinoma with pulmonary metastasis in an Asian Purple Swamphen (Porphyrio porphyrio), and an undifferentiated carcinoma in the abdomen with metastasis to skeletal muscle in a White-Breasted Waterhen (Amaurornis phoenicurus).