France vs French Republic

France and French Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
France	Yes	No	No	No
French Republic	Yes	No	No	No

As nouns, France and French Republic are synonyms defined as:

France and French Republic: a republic in western Europe; the largest country wholly in Europe

France (noun)	French Republic (noun)
a republic in western Europe; the largest country wholly in Europe	a republic in western Europe; the largest country wholly in Europe
French writer of sophisticated novels and short stories (1844-1924)