What's the difference between rampallian and rapscallion?

Rampallian

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Definition:

• (n.) A mean wretch.

Example Sentences:

Rapscallion

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Definition:

• (n.) A rascal; a good-for-nothing fellow.

Example Sentences:

• (1) Now in his mid-50s, he is in possession of a certain rapscallion charm.