Neither, even though you have not identified the constituent substance
of the 2.5 pounds. Whatever it is, the weights you've listed are equal.
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32 ounces
They weigh the same!
3 pounds of butter
There will be more feathers but the weight will be the same :10 pounds of feathers 10 pounds of gold 10 pounds of each <><><> In MOST cases, would agree with the above, but GOLD is different. Gold, Platinum, and all precious metals are measured in TROY ounces and TROY pounds, where feathers are measured in ordinary (avoirdupois) pounds. A TROY pound has 12 ounces instead of 16, and is not as heavy as a standard pound. This is the rare case of a pound NOT being a pound.
2 pounds is 2 pounds, whether it is bricks or feathers.