Reykjavik vs capital of Iceland

Reykjavik and capital of Iceland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Reykjavik	Yes	No	No	No
capital of Iceland	Yes	No	No	No

As nouns, Reykjavik and capital of Iceland are synonyms defined as:

Reykjavik and capital of Iceland: the capital and chief port of Iceland on the southwestern coast of Iceland; buildings are heated by natural hot water

Reykjavik (noun)	capital of Iceland (noun)
the capital and chief port of Iceland on the southwestern coast of Iceland; buildings are heated by natural hot water	the capital and chief port of Iceland on the southwestern coast of Iceland; buildings are heated by natural hot water