fad vs. fade
fad (a style, activity, or interest that is very popular but does not last very long)
- I think that wearing ripped jeans is not a fad; it’s here to stay.
- His interest in walking in the mountains is just a fad.
fade (disappear gradually, lose color)
- The children watched the plane till it faded from view.
- Don’t hang your dress out in the strong sunlight; it will fade.