What's the difference between campanologist and campanology?

Campanologist

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Definition:

• (n.) One skilled in campanology; a bell ringer.

Example Sentences:

• (1) Doctors should be aware of the dangers to which campanologists expose themselves.

Campanology

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Definition:

• (n.) The art of ringing bells, or a treatise on the art.

Example Sentences:

• (1) For services to Public Finances and voluntary service to Campanology.