What's the difference between stiddy and stithy?

Stiddy

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Definition:

• (n.) An anvil; also, a smith shop. See Stithy.

Example Sentences:

Stithy

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Definition:

• (n.) An anvil.
• (n.) A smith's shop; a smithy; a smithery; a forge.
• (v. t.) To forge on an anvil.

Example Sentences: