What's the difference between dabchick and dobber?

Dabchick

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Definition:

• (n.) A small water bird (Podilymbus podiceps), allied to the grebes, remarkable for its quickness in diving; -- called also dapchick, dobchick, dipchick, didapper, dobber, devil-diver, hell-diver, and pied-billed grebe.

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Dobber

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Definition:

• (n.) See Dabchick.
• (n.) A float to a fishing line.

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