As you have stated, a corrie, is a land feature created by glaciation on the slopes of a mountain.
Due to the bowl shape of the corrie, water often gathers in corries forming a small loch known as a corrie lochan or tarn. Sometimes the galcier cuts an exit channel (downslope) and the bowl stays as a corrie.
So, if there is water in the bowl... it is a tarn.
Hope this helps.
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