Florida gallinule vs swamphen

Florida gallinule and swamphen both are nouns.

Word	Noun	Adjective	Verb	Adverb
Florida gallinule	Yes	No	No	No
swamphen	Yes	No	No	No

As nouns, swamphen is a hypernym of Florida gallinule; that is, swamphen is a word with a broader meaning than Florida gallinule:

Florida gallinule: North American dark bluish-grey gallinule
swamphen: any of various small aquatic birds of the genus Gallinula distinguished from rails by a frontal shield and a resemblance to domestic hens

Other hypernyms of Florida gallinule include gallinule, marsh hen, water hen.

Florida gallinule (noun)	swamphen (noun)
North American dark bluish-grey gallinule	any of various small aquatic birds of the genus Gallinula distinguished from rails by a frontal shield and a resemblance to domestic hens