ivory gull vs gull

ivory gull and gull both are nouns.

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

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

ivory gull: white Arctic gull; migrates as far south as England and New Brunswick
gull: mostly white aquatic bird having long pointed wings and short legs

Other hypernyms of ivory gull include sea gull, seagull.

ivory gull (noun)	gull (noun)
white Arctic gull; migrates as far south as England and New Brunswick	mostly white aquatic bird having long pointed wings and short legs
	a person who is gullible and easy to take advantage of

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