Republic of Uzbekistan vs Uzbek

Republic of Uzbekistan and Uzbek both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Uzbekistan	Yes	No	No	No
Uzbek	Yes	No	No	No

As nouns, Republic of Uzbekistan and Uzbek are synonyms defined as:

Republic of Uzbekistan and Uzbek: a landlocked republic in west central Asia; formerly an Asian soviet

Other synonyms of Republic of Uzbekistan include Uzbekistan.

Republic of Uzbekistan (noun)	Uzbek (noun)
a landlocked republic in west central Asia; formerly an Asian soviet	the Turkic language spoken by the Uzbek
	a landlocked republic in west central Asia; formerly an Asian soviet
	a member of a Turkic people of Uzbekistan and neighboring areas