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ころ, ごろ
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A spoon to measure a geoduck is a very approximate measurement. Geoducks are big, spoons are small. Still, we'll get the approximation going, right?
Maybe this is too much geoduck, even if we're going for an approximate. So, you take the core (ころ) of the geoduck and measure that instead.
Currently there are no similar looking kanji which exist in the WaniKani learning system