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13x13 · 20 words · medium
FLUORESCENCE, LANTERNFISH, HATCHETFISH, ANGLERFISH, DRAGONFISH, PHOTOPHORE, LUCIFERASE, VIPERFISH, JELLYFISH, LUCIFERIN, GLOWWORM, BACTEIRA, PLANKTON, ABYSSAL, BATHYAL, HADAL, OCEAN, SQUID, COMB, DEEP