Hawaii vs HI

Hawaii and HI both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hawaii	Yes	No	No	No
HI	Yes	No	No	No

As nouns, Hawaii and HI are synonyms defined as:

Hawaii and HI: a state in the United States in the central Pacific on the Hawaiian Islands

Other synonyms of Hawaii include Aloha State, Haw., Hawai'i.

Hawaii (noun)	HI (noun)
a state in the United States in the central Pacific on the Hawaiian Islands	a state in the United States in the central Pacific on the Hawaiian Islands
the largest and southernmost of the Hawaii islands; has several volcanic peaks