pewit gull vs blackcap

pewit gull and blackcap both are nouns.

Word	Noun	Adjective	Verb	Adverb
pewit gull	Yes	No	No	No
blackcap	Yes	No	No	No

As nouns, pewit gull and blackcap are synonyms defined as:

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

pewit gull (noun)	blackcap (noun)
small black-headed European gull	small brownish-grey warbler with a black crown
	chickadee having a dark crown
	small black-headed European gull
	raspberry native to eastern North America having black thimble-shaped fruit