What's the difference between shagbark and shellbark?

Shagbark

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Definition:

• (n.) A rough-barked species of hickory (Carya alba), its nut. Called also shellbark. See Hickory.
• (n.) The West Indian Pithecolobium micradenium, a legiminous tree with a red coiled-up pod.

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Shellbark

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Definition:

• (n.) A species of hickory (Carya alba) whose outer bark is loose and peeling; a shagbark; also, its nut.

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