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MUCUS
Mucus (noun) — protective secretion of the mucus membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium.
Mucus is a valid 5-letter word worth 9 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.