κατακλύζωkataklýzō

to inundate, deluge: passive, 2 Peter 3:6.

Greek (New Testament) · G2626

Same root

κατάkatá · G2596(prepositionally) down (in place or time), in varied relations (according to the case (genitive, dative or accusative) with which it is joined)
κλύδωνklýdōn · G2830a surge of the sea (literally or figuratively)
κατακλυσμόςkataklysmós · G2627an inundation

Where it appears

Appears 1 times in the Bible.

2 Peter 3:6 Then he used the water to destroy the ancient world with a mighty flood.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.