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Pronunciation varies by accent · noun
Aythya collaris, a diving duck of North America with a white band around the bill..
Use ring bill when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ring bill means Aythya collaris, a diving duck of North America with a white band around the bill..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ring bill where its definition matches the intended context.
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