What's the difference between polyzoa and polyzoan?

Polyzoa

Definition:

• (n. pl.) Same as Bryozoa. See Illust. under Bryozoa, and Phylactolaemata.
• (pl. ) of Polyzoon

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Polyzoan

Definition:

• (n.) Any species of Polyzoa; one of the Polyzoa.
• (n.) A polyzoon.

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