Larus ridibundus vs laughing gull

Larus ridibundus and laughing gull both are nouns.

Word	Noun	Adjective	Verb	Adverb
Larus ridibundus	Yes	No	No	No
laughing gull	Yes	No	No	No

As nouns, Larus ridibundus and laughing gull are synonyms defined as:

Other synonyms of Larus ridibundus include blackcap, pewit, pewit gull.

Larus ridibundus (noun)	laughing gull (noun)
small black-headed European gull	small black-headed European gull