Would you please tell me the difference between "water well" and "water pit"?
Thank you
I would suppose that the former is deeper and descends to a subterranean water reservoir, while the latter is shallower and depends on ground water seepage.

But I really don't know.
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In the US, you'd generally hear simply, "well," that is, saying "water well" would usually be redundant, since wells are almost always for water.

"Water pit" would be unusual. The word "pit" generally implies a dry hole. "Water pit" might be used to mean a hole for storing non-potable water, say, at a mining site.

You are right...now I know the differnce between pit and well.

As an adjective "well" implies is in good health.

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