island vs GB

island and GB both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
GB	Yes	No	No	No

island (noun)	GB (noun)
a zone or area resembling an island	an island comprising England and Scotland and Wales
a land mass (smaller than a continent) that is surrounded by water	a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
	a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes
	a highly toxic chemical nerve agent that inhibits the activity of cholinesterase