French Republic vs department

French Republic and department both are nouns.

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

French Republic (noun)	department (noun)
a republic in western Europe; the largest country wholly in Europe	a specialized sphere of knowledge
	a specialized division of a large organization
	the territorial and administrative division of some countries (such as France)