country vs tax haven

country and tax haven both are nouns.

Word	Noun	Adjective	Verb	Adverb
country	Yes	No	No	No
tax haven	Yes	No	No	No

As nouns, tax haven is a hyponym of country; that is, tax haven is a word with a more specific, narrower meaning than country:

country (noun)	tax haven (noun)
a politically organized body of people under a single government	a country or independent region where taxes are low
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)