in a reaction between oxidant and reductant which will give up electrons and which will accept electron

Any species that undergoes oxidation is itself a reducing agent or reductant.

The species that undergoes reduction in the course of a chemical reaction is an oxidant or reducing agent.

Oxidation is defined as the loss of electrons, addition of oxygen and increase in oxidation number of a specie. Reduction is the gain of electrons, removal of oxygen and decrease in oxidation number of a specie.

Any specie that loses electrons to another undergoes oxidation and is a reductant.

Species that gains electrons are called oxidant.