Liberian capital vs Monrovia

Liberian capital and Monrovia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Liberian capital	Yes	No	No	No
Monrovia	Yes	No	No	No

As nouns, Liberian capital and Monrovia are synonyms defined as:

Liberian capital and Monrovia: the capital and chief port and largest city of Liberia

Other synonyms of Liberian capital include capital of Liberia.

Liberian capital (noun)	Monrovia (noun)
the capital and chief port and largest city of Liberia	the capital and chief port and largest city of Liberia