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Lead
Neither!!! They both have the same mass at 1 kg. However, the feathers will occupy a greater volume.
The mass of feathers is far greater than the lead. amount = mass So you will have a huge pile of feathers compared to a small chunk of lead to equal a pound
The density of a material is defined as its mass per unit volume. A given volume of lead has more mass than a given volume of feathers. In common usage mass often refers to weight, but that is not a very exact usage of it. For this question it may be useful however to think of a given weight of lead per volume and a given weight of feathers.If you have a kg of lead, that is a small piece, a kg of feathers is a large amount.So for a given volume, say a cubic centimeter, the weight of lead is much more than the weight of feathers.
A pound of feathers because feathers are less dense than lead and therefore take up more volume for the same mass.