What's the difference between sabbatarian and sabbatarianism?

Sabbatarian

Definition:

• (n.) One who regards and keeps the seventh day of the week as holy, agreeably to the letter of the fourth commandment in the Decalogue.
• (n.) A strict observer of the Sabbath.
• (a.) Of or pertaining to the Sabbath, or the tenets of Sabbatarians.

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Sabbatarianism

Definition:

• (n.) The tenets of Sabbatarians.

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