larid vs sea gull

larid and sea gull both are nouns.

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

As nouns, sea gull is a hyponym of larid; that is, sea gull is a word with a more specific, narrower meaning than larid:

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

Other hyponyms of larid include gull, seagull, tern.

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