The word used to refer to Korah’s “rebellion” in Jude 11 is ἀντιλογία. It has a decently wide range of meaning, but the word is also used throughout the OT to refer to other similar events. This excerpt from our Jude Greek Reading Videos gives a brief explanation of how this word is used, which sheds a little light on what kind of thoughts the word ἀντιλογία would evoke.
https://youtu.be/pLRTOuxT8_Y&rel=0
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