What's the difference between pilewort and pillwort?

Pilewort

Definition:

• (n.) A plant (Ranunculus Ficaria of Linnaeus) whose tuberous roots have been used in poultices as a specific for the piles.

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Pillwort

Definition:

• (n.) Any plant of the genus Pilularia; minute aquatic cryptograms, with small pill-shaped fruit; -- sometimes called peppergrass.

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