Fairly long (and reasonably common) words in
which no letter appears more than once

See copyright notice.
(also note list of words with frequent re-occurrences at bottom)

Mail suggestions to ddailey@sru.edu

10 letters

authorized avouchment background backslider bankruptcy bawdyhouse
becomingly  compatible franchized hypodermic methodical republican syncopated (I've got hundreds more of these now)

11 letters

atmospheric bicephalous blameworthy centrifugal christendom combatively comradeship construable consumptive countervail countryside customarily dangerously demographic disgraceful disturbance documentary draughtsmen enchymatous exculpation exculpatory explicatory expurgation facetiously
filamentous geophysical imprudently inscrutable insuperably lactiferous lycanthrope misanthrope misanthropy nefariously neighbourly observantly obtrusively personality polyandrism polygastric predictably problematic  providently righteously scenography secondarily showjumping speculation stenography sublevation subordinacy subordinate subtropical switchboard sympathizer tenaciously thunderclap tragicomedy valedictory workmanship zincography

12 letters

ambidextrous bluestocking considerably housewarming hyperthalmic lexicography productively recognizably triadelphous unforgivable unforgivably unprofitable

13 letters

copyrightable unpredictably

14 letters

ambidextrously

15 letters

uncopyrightable (from Disraeli: Curiosities of literature via Johan Santesson [sante@bart.nl])


Words with letters that often reoccur:

ceaselessness 5 s ; 4 e
conscientiousness 4 s ; 3 n
consentaneousness 4 s ; 4 n ; 3 e
counterintelligence 4 e ; 3 n
defenselessness 5 s ; 4 e
instantaneousness 4 n ; 4 s
interchangeableness 4 e ; 3 n
restlessness 5 s ; 3 e
successlessness 7 s ; 3 e
tastelessness 5 s ; 3 e
tete-a-tete 4 e ; 4 t
transubstantiation 4 t ; 3 a; 3 n
unintelligibility 5 i ; 3 l