Zambezi vs Northern Rhodesia

Zambezi and Northern Rhodesia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zambezi	Yes	No	No	No
Northern Rhodesia	Yes	No	No	No

Zambezi (noun)	Northern Rhodesia (noun)
the fourth-longest river in Africa; flows into the Indian Ocean	a republic in central Africa; formerly controlled by Great Britain and called Northern Rhodesia until it gained independence within the commonwealth in 1964