Azerbaijan vs Azerbajdzhan Republic

Azerbaijan and Azerbajdzhan Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Azerbaijan	Yes	No	No	No
Azerbajdzhan Republic	Yes	No	No	No

As nouns, Azerbaijan and Azerbajdzhan Republic are synonyms defined as:

Azerbaijan and Azerbajdzhan Republic: a landlocked republic in southwestern Asia; formerly an Asian soviet

Other synonyms of Azerbaijan include Azerbaijani Republic, Azerbajdzhan.

Azerbaijan (noun)	Azerbajdzhan Republic (noun)
a landlocked republic in southwestern Asia; formerly an Asian soviet	a landlocked republic in southwestern Asia; formerly an Asian soviet