A quantity of coins, usually deliberately concealed or stored at some time in the past, and the same when it is subsequently discovered.
A group of valuable objects, (most commonly metal, but not exclusively so), which has been hidden, (usually in the ground, but could be wall- or roof-spaces). The material may have been left for a number of reasons.
A group of coins held for either numismatic or monetary reasons.
A deposit of coins secreted in the past; discovered accidentally.
In archaeology, a hoard is a collection of artifacts purposely buried in the ground. This would usually be with the intention of later recovery by the hoarder; forgetfulness, or the death of the hoarder, meant that some hoards were never recovered. They survive, to be uncovered by metal-detectorists, members of the public and archaeologists much later.