What's the difference between hymnody and hymnology?

Hymnody

Definition:

• (n.) Hymns, considered collectively; hymnology.

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Hymnology

Definition:

• (n.) The hymns or sacred lyrics composed by authors of a particular country or period; as, the hymnology of the eighteenth century; also, the collective body of hymns used by any particular church or religious body; as, the Anglican hymnology.
• (n.) A knowledge of hymns; a treatise on hymns.

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