How you rate: 11 words, average; 15, good; 19, very good; 23, excellent.
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Source: the Times
Answers on the continuation page.
dart, dastur, drat, rass, rats, rusa, sard, star, start, stat, status, stratus, sura, sutra, sutta, tarsus, tart, tass, taut, trad, tsar, ustad
stardust is the word using all the letters.