sea gull vs larid

sea gull and larid both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea gull	Yes	No	No	No
larid	Yes	No	No	No

As nouns, larid is a hypernym of sea gull; that is, larid is a word with a broader meaning than sea gull:

sea gull: mostly white aquatic bird having long pointed wings and short legs
larid: long-winged web-footed aquatic bird of the gull family

sea gull (noun)	larid (noun)
mostly white aquatic bird having long pointed wings and short legs	long-winged web-footed aquatic bird of the gull family