Larus ridibundus vs pewit

Larus ridibundus and pewit both are nouns.

Word	Noun	Adjective	Verb	Adverb
Larus ridibundus	Yes	No	No	No
pewit	Yes	No	No	No

As nouns, Larus ridibundus and pewit are synonyms defined as:

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

Larus ridibundus (noun)	pewit (noun)
small black-headed European gull	large crested Old World plover having wattles and spurs
	small olive-colored woodland flycatchers of eastern North America
	small black-headed European gull