excess (an amount that is more than necessary, reasonable or acceptable): The excess sugar in her diet led to weight gain.
surplus (an amount that is more than what is needed or used): This country has a considerable surplus of grain.
overflow (an amount that cannot fit in a space): They put up sandbags to stop the overflow of the river. We have set up tents beside the hospital to handle the overflow.
glut (a supply of something that far exceeds what is needed): A glut of oil in the market caused prices to drop sharply.
superfluity formal (a quantity of something that is more than necessary): The city has a superfluity of traffic signs.
overkill (beyond what is necessary or reasonable): Hiring a famous band for a birthday party seems to be overkill.
