country vs political unit

country and political unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
country	Yes	No	No	No
political unit	Yes	No	No	No

As nouns, political unit is a hypernym of country; that is, political unit is a word with a broader meaning than country:

Other hypernyms of country include political entity.

country (noun)	political unit (noun)
a politically organized body of people under a single government	a unit with political responsibilities
the people who live in a nation or country
the territory occupied by a nation
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)