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13x13 · 22 words · easy
PERISTALSIS, FLATULENCE, GOOSEBUMPS, METABOLISM, ADRENALINE, LYMPHOCYTE, DIGESTION, SEROTONIN, MELATONIN, PHAGOCYTE, ANTIBODY, PLATELET, SYNAPSE, CERUMEN, GASTRIC, SNEEZE, HICCUP, BLUSH, MUCUS, SEBUM, BURP, YAWN