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The only words with "uu" are vacuum, muumuu, residuum, and continuum

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sign, mark(noun)
a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
Synonyms: marking, signaling, augury, mark, sucker, house, bell ringer, target, crisscross, preindication, polarity, fall guy, star sign, stigma, score, sign, mansion, brand, grade, planetary house, chump, signal, sign of the zodiac, mug, signboard, foretoken, scratch, home run, gull, patsy, fool, marker, scrape, cross, print, scar, stain, bull's eye, soft touch
Antonyms: uncommunicative, incommunicative