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There are 184 thirteen-letter words containing OPT

acanthopteranacoustoopticsactinopterianactinoptygianadoptianisticadoptionisticantiapoptosisantiapoptoticantioptimistsantioptionistapoptoticallyarchaeopteridarchaeopteryx archæopteryxarchaiopteryxautopteroticsbalaenopteridcalopterygidscalopterygoidcatadioptricscatoptricallycatoptromancychaetopteridscheiropterouschiropteristschondroptosiscoleoptericincoleopteristsconiopterygidcosmopterigidcosmopterygidcyberoptimismcyberoptimistdactylopteriddermopteroticdichopticallydictyopteransdrop␣the␣glovesearly␣adoptersectopterygoidelectroopticselectropticalelectroptodesendopterygoidendopterygoteensynopticityentopterygoidentoptoscopesentoptoscopicentoptychinesepidermoptidsexopterygotesfloptical␣diskfosdenopteringastropteridsgigantopteridglossopteridsgripopterygidhelicopterfulhelicopteringhelicopter␣momhelicopteronsheteropteransheteropteroushistiopteridsholoptychiidshymenoptaecinhymenopteranshymenopteristhymenopteronshymenopterousiniopterygianlasiopterineslepidopteranslepidopterismlepidopteristlepidopteronslepidopterouslipoapoptosislipoapoptoticlonchopteridsmagnetoopticsmagnetopticalmechanoptosismegalopteransmesopterygialmesopterygiummesopterygoidmethanopterinmicropterigidmisoptimizingmolybdopterinnecroptosomesneopterygiansneutron␣opticsnonoptimalitynonoptimisticnonoptionallynuclear␣optiononcoapoptosisoncoapoptoticopen␣adoptionsopthalmoscopeoptical␣doubleoptical␣drivesoptical␣fibersoptical␣fibresoptical␣isomeroptical␣powersoptical␣switchoptic␣foraminaoptic␣neuritisopticokineticoptimisationsoptimizationsoptionalisingoptionalitiesoptionalizingoption␣buttonsoptoacousticsoptocapillaryoptochemokineoptoelectrodeoptogeneticaloptoinjectantoptoinjectionoptoisolationoptoisolatorsoptomagnonicsoptomechanicsoptoplasmonicoptoporationsorthopteristsorthopteroidsorthropteroidoveroptimismsoveroptimistsoveroptimizedoveroptimizespalaeopteransparaneopteranparcelcoptersPareto-optimal Pareto␣optimalphaegopterinephaneropteridphœnicopterspolyneopteranpostapoptoticpreoptimisingpreoptimizingprisoptometerpseudopteranepsilopterinespteroptochidsptychopteridspyranopterinsquadrocopterssarcinopterinscioptic␣ballsscoptophiliacspodoptericinstereopticansstereopticonssternoptychidstop␣the␣lightssuboptimality sub-optimalitysuboptimizingtaeniopteridstaeniopteroidthysanopterantrichopteranstrichopteroustriple␣optionstungstopterinunadopted␣roadunderoptimizeunoptimizablevisceroptosisvisceroptoticxanthopterinexanthopterinsxeropthalmias

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