Witwatersrand vs Reef

Witwatersrand and Reef both are nouns.

Word	Noun	Adjective	Verb	Adverb
Witwatersrand	Yes	No	No	No
Reef	Yes	No	No	No

As nouns, Witwatersrand and Reef are synonyms defined as:

Witwatersrand and Reef: a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese

Other synonyms of Witwatersrand include Rand.

Witwatersrand (noun)	Reef (noun)
a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese	a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese