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Horizontal mirror words are terms composed exclusively of capital letters that possess horizontal line symmetry (B, C, D, E, H, I, K, O, X).
Nine letters of the English uppercase alphabet have horizontal line symmetry: B, C, D, E, H, I, K, O, and X. When written in all caps, words made exclusively from these letters reflect identically across a horizontal plane, meaning their top half mirrors their bottom half. Classic examples include "CHECKBOOK", "EXCEEDED", "COOKBOOK", "DECIDE", "CHICK", and "BED".
Test any word to verify if its capital letters have horizontal line symmetry:
Verified English words exemplifying horizontal mirror words (line symmetry) with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
A horizontal mirror word is spelled only with letters that possess horizontal reflection symmetry: B, C, D, E, H, I, K, O, and X.