くろい
black, dark
Soot in the window with the fire underneath it, which is where soot comes from. The crow くろい on the fence is that colour all over, beak included: くろい.
黒 くろ is the colour as a noun. Same 黒 as 黙る だまる, where it sits over a dog. 暗い くらい is dark as in no light rather than the colour.
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