Superfluous
Part of speech: adjective
Definition: in excess of what is required or sufficient
Example sentence: Let us assume that the ideal were reached; let us imagine a state of international life in which the danger of war no longer exists. Then no one would dare to demand a penny for obviously completely superfluous armaments.
Redundant
Part of speech: adjective
Definition: Superfluous; exceeding what is necessary.Repetitive or needlessly wordy.Dismissed from employment because no longer needed.Duplicating or able to duplicate the function of another component of a system, providing back-up in the event the other component fails.
Example sentence: Being made redundant is a personal tragedy.