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The two words aren't supposed to be related. MO is using recaptcha. The clever idea behind it is that these are words from scanned books that the OCR software had trouble with, so they solicit the help of humans to figure out the correct meaning. One of the words has already been solved by another user, and is used for verification. The other is entered into the database to be used for future verifications.
Of course, in an ideal world, recaptcha should have data from several languages, so you can select a more familiar one. But this is not such a world.
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