Countries are states.
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Could be both.
If you want to nitpick and get into political theory: Some countries are referred to as states. Iceland is sometimes referred to as a Nation-State. So some States are republics.
And some countries (that are not, by definition a State) are republics.
There is a pretty good description of what a nation state is at Wise Geek. They break it down into understandable language if this confuses you still.
Country. actually Dominican Republic is An Island
republic (a country whose head of state is not a monarch)
A constitutional republic is a state where the head of state and other officials have control over the country, but they must get elected by the citizens of that country or state.
The Republic of Guinea is a country.
It doesn't its a country. The Dominican Republic is a country composed for one state, better known as EL ESTADO DOMINICANO (THE DOMINICAN STATE)
The Federal Republic of Nigeria is a country in western Africa.
No it's a state in Russia
The Republic of Ireland is a country which is bordered by the United kingdom. The border is along the line which sepparates the state of Northern Ireland with the Republic of Ireland.
no it is a country
A country with no hereditary ruler; the head of state is elected
The Dominican Republic is a country conformed by only One State named The Dominican State which has 48,442 km² and 9,445,281 habitant.
Ireland was a country in 1800.