Independent State of Papua New Guinea vs New Guinea

Independent State of Papua New Guinea and New Guinea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Independent State of Papua New Guinea	Yes	No	No	No
New Guinea	Yes	No	No	No

Independent State of Papua New Guinea (noun)	New Guinea (noun)
a parliamentary democracy on the eastern half of the island of New Guinea; in 1975 it became an independent state within the Commonwealth of Nations	a Pacific island to the north of Australia; the 2nd largest island in the world; the western part is governed by Indonesia and the eastern part is Papua New Guinea