blackcap vs gull

blackcap and gull both are nouns.

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

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

Other hypernyms of blackcap include sea gull, seagull.

blackcap (noun)	gull (noun)
small brownish-grey warbler with a black crown	mostly white aquatic bird having long pointed wings and short legs
chickadee having a dark crown	a person who is gullible and easy to take advantage of
small black-headed European gull
raspberry native to eastern North America having black thimble-shaped fruit

blackcap (verb)	gull (verb)
	fool or hoax
	make a fool or dupe of