country vs department

country and department both are nouns.

Word	Noun	Adjective	Verb	Adverb
country	Yes	No	No	No
department	Yes	No	No	No

country (noun)	department (noun)
a politically organized body of people under a single government	a specialized sphere of knowledge
the people who live in a nation or country	a specialized division of a large organization
the territory occupied by a nation	the territorial and administrative division of some countries (such as France)
an area outside of cities and towns
a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)