Republic of India vs Hyderabad

Republic of India and Hyderabad both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of India	Yes	No	No	No
Hyderabad	Yes	No	No	No

Republic of India (noun)	Hyderabad (noun)
a republic in the Asian subcontinent in southern Asia; second most populous country in the world; achieved independence from the United Kingdom in 1947	a city in south central India in Andhra Pradesh
	a city in southern Pakistan on the Indus River