Qatar vs State of Katar

Qatar and State of Katar both are nouns.

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

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

Qatar and State of Katar: 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 Qatar.

Qatar (noun)	State of Katar (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