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There are 72 sixteen-letter words containing OPT

acanthopterygianactinopterygiansactinopterygiianactynopterigiansadoptive␣siblingsarchaeopterygidsattack␣helicopterblack␣helicopterschaoyangopteridschiropterochoricchiropterologistchiropterophiliachiropterophilicchondropterygianchromatoptometerclothing-optional clothing␣optionalcoleopterologistcottontop␣tamarincrossopterygiansdihydrobiopterindihydroneopterindihydropteridinedryopteridaceouselectroopticallyeosauropterygianeusauropterygianhelicopter␣buckethelicopter␣parentichthyopterygianichthyopterygiummacrolepidopteramalacopterygiansmalacopterygiousmegachiropteransmicrochiropteranmicrocoleopteranmicrolepidopteraneuropterologistnonlepidopterousodontopterygiansoptical␣astronomyoptical␣black␣holeoptical␣delusionsoptical␣disc␣driveoptical␣disk␣driveoptical␣illusionsoptical␣rotationsoptical␣spectrumsoptical␣telescopeoptimality␣theoryoptoacousticallyoptoelectricallyoptomechanicallyoptomechatronicsoptostimulationsorthopterologistoveroptimizationPareto␣optimalityPhœnicopteridæpreoptimizationspseudopterolidessuboptimisationssuboptimizationssuperpanopticonsteardrop␣trailerstristichopteridsunoptimisticallyvomeropterygoidswaeringopteroidswhistlestop␣toursyangochiropteran

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