Uzbekistan vs Uzbek

Uzbekistan and Uzbek both are nouns.

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

As nouns, Uzbekistan and Uzbek are synonyms defined as:

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

Other synonyms of Uzbekistan include Republic of Uzbekistan.

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