Sultanate of Oman vs Oman

Sultanate of Oman and Oman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sultanate of Oman	Yes	No	No	No
Oman	Yes	No	No	No

As nouns, Sultanate of Oman and Oman are synonyms defined as:

Sultanate of Oman and Oman: a strategically located monarchy on the southern and eastern coasts of the Arabian Peninsula; the economy is dominated by oil

Other synonyms of Sultanate of Oman include Muscat and Oman.

Sultanate of Oman (noun)	Oman (noun)
a strategically located monarchy on the southern and eastern coasts of the Arabian Peninsula; the economy is dominated by oil	a strategically located monarchy on the southern and eastern coasts of the Arabian Peninsula; the economy is dominated by oil