5 letters · 10 points in Scrabble
noun a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)
originFrom Middle English abissus, from Late Latin abyssus (“a bottomless gulf”), from Ancient Greek ἄβυσσος (ábussos, “bottomless”), from ἀ- (a-, “not”) + βυσσός (bussós, “deep place”), from βυθός (buthós, “deep place”). Displaced native Old English neowolnes.
Etymology from Wiktionary, CC BY-SA 3.0