seafowl vs seabird

seafowl and seabird both are nouns.

Word	Noun	Adjective	Verb	Adverb
seafowl	Yes	No	No	No
seabird	Yes	No	No	No

As nouns, seafowl and seabird are synonyms defined as:

seafowl and seabird: a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc.

Other synonyms of seafowl include sea bird.

seafowl (noun)	seabird (noun)
a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc.	a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc.