A federal republic is a federation of states with a republican form of government. A federation is the central government. The states in a federation also maintain the federation. Usage of the term republic is inconsistent but, as a minimum, it means a state or federation of states that does not have a monarch.
A Republic does not say anything about the inner organisation (central or federal) and only means that the country is rules by a form of government in which the people or some portion thereof retain supreme control over the government, and in which the head of government is not a monarch.
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A federal republic is a federation of states with a republican form of government. A federation is the central government. The states in a federation also maintain the federation. Usage of the term republic is inconsistent but, as a minimum, it means a state or federation of states that does not have a monarch.
A Republic does not say anything about the inner organisation (central or federal) and only means that the country is rules by a form of government in which the people or some portion thereof retain supreme control over the government, and in which the head of government is not a monarch.