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RUST
Rust (noun) — a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture. 2. (noun) a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi.
Rust is a valid 4-letter word worth 4 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.