What's the difference between rapter and ratter?

Rapter

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Definition:

• (n.) A raptor.

Example Sentences:

Ratter

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Definition:

• (n.) One who, or that which, rats, as one who deserts his party.
• (n.) Anything which catches rats; esp., a dog trained to catch rats; a rat terrier. See Terrier.

Example Sentences:

• (1) I rather like Bryant – a "little wire-haired ratter", according to Daphne – who becomes increasingly bombastic as the book proceeds.