I grew up in East Texas where we call small bodies of water a pond, which I believe is common for most of the English speaking world. However, in West Texas they tend to call them tanks, as they are used primarily for watering livestock. Some people will get passionate about the differences between the two words, but my experience is people tend to use them synonymously.
Here is my situation: Where I live now, in Central Texas, I hear both tank and pond used. It all depends on the origin of the speaker. I am working on a novel set in Central Texas, and I need to use either the word pond or tank. Tank gives the setting some ambiance, but not all readers might understand the usage. I can see pros and cons for both words.
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