Synonym of FAD

Charity : an organization set up to provide help and raise money for those in need.
Weakness : the state or condition of being weak.
Fashion : a popular or the latest style of clothing, hair, decoration, or behaviour.
Folly : lack of good sense; foolishness.
Fad : an intense and widely shared enthusiasm for something, especially one that is short-lived; a craze.

Synonym of Fad is Fashion