Qatar vs State of Qatar

Qatar and State of Qatar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Qatar	Yes	No	No	No
State of Qatar	Yes	No	No	No

As nouns, Qatar and State of Qatar are synonyms defined as:

Qatar and State of Qatar: an Arab country on the peninsula of Qatar; achieved independence from the United Kingdom in 1971; the economy is dominated by oil

Other synonyms of Qatar include Katar, State of Katar.

Qatar (noun)	State of Qatar (noun)
an Arab country on the peninsula of Qatar; achieved independence from the United Kingdom in 1971; the economy is dominated by oil	an Arab country on the peninsula of Qatar; achieved independence from the United Kingdom in 1971; the economy is dominated by oil
a peninsula extending northward from the Arabian mainland into the Persian Gulf