There is not one.
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The longest common English word you can make from the top line of your keyboard or qwertyuiop is typewriter (10 letters).The longest possible word is rupturewort, a type of plant (11 letters).The longest slang word using all letters only once is wipeout (7 letters). The longest formal words have six letters : equity, poetry, purity, pyrite, torque, troupe and qwerty (it means the kind of keyboard we are now using).
These letters are all on the top alphabet line on a keyboard.All of these letters can be used once in the words "Prow equity" and others. There are about 140 common words that can be spelled using these 10 letters once. The longest words have 6 letters : Equity, Poetry, Purity, Pyrite, Torque, and Troupe. (The slang word wipeout has seven.)(see related question)
There are no possible words that can be spelled with all of these letters. The longest possible word is shrapnel.
There is no 9 letter word in English that can be spelled using those letters.Words that can be spelled from those letters are:egoeonexitextolgelgeltgentgetgiltginglintgogonegotIiningotinletinnintointoneionitleglegionleilentletlielienlinelinenlingolintlionlitlologloinlonelonglotloxneonnetnextnilninenitnonoelnonenotnotenotingoilononlineoxoxententenontietiltiletintinetingetingletotoetoeingtogtoiltoiletoletontonetoningtoxinxenon
No words can be spelled using all of these letters. The longest words that can be spelled have eight letters. They include poetries and poetiser.