El Qahira vs capital of Egypt

El Qahira and capital of Egypt both are nouns.

Word	Noun	Adjective	Verb	Adverb
El Qahira	Yes	No	No	No
capital of Egypt	Yes	No	No	No

As nouns, El Qahira and capital of Egypt are synonyms defined as:

El Qahira and capital of Egypt: the capital of Egypt and the largest city in Africa; a major port just to the south of the Nile delta; formerly the home of the Pharaohs

Other synonyms of El Qahira include Al Qahira, Cairo, Egyptian capital.

El Qahira (noun)	capital of Egypt (noun)
the capital of Egypt and the largest city in Africa; a major port just to the south of the Nile delta; formerly the home of the Pharaohs	the capital of Egypt and the largest city in Africa; a major port just to the south of the Nile delta; formerly the home of the Pharaohs