darter vs pelecaniform seabird

darter and pelecaniform seabird both are nouns.

Word	Noun	Adjective	Verb	Adverb
darter	Yes	No	No	No
pelecaniform seabird	Yes	No	No	No

As nouns, pelecaniform seabird is a hypernym of darter; that is, pelecaniform seabird is a word with a broader meaning than darter:

darter: fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill
pelecaniform seabird: large fish-eating seabird with four-toed webbed feet

darter (noun)	pelecaniform seabird (noun)
a person or other animal that moves abruptly and rapidly	large fish-eating seabird with four-toed webbed feet
fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill