13 letters

eucharistized euchlorhydria euchromatopsy euchysiderite Eucnemesaurus eucorticalism eucryphiaceae eucrystalline eudaemonistic ∙ eudiaphoresis eudicotyledon ∙ eudiometrical ∙ eugeosyncline ∙ Eugregarinida euhydrophytes eumerogenesis eumerogenetic eumeromorphic Eumycetozoida eunuchoidisms ∙ eupancreatism eupanorthidae eupepticities ∙ euphausiacean ∙ euphemisation euphemistical euphemization Euphorbiaceae euphototropic eupomatiaceae Eurhinosaurus Eurocommunism europeanising ∙ europeanizing ∙ europocentric euroterminals ∙ eurotophilous euryblepharon eurycephalous eurycerotidae eurypteroidea eurystomatous Euskelosaurus eusporangiate ∙ euthanasiasts ∙ euthanatising ∙ euthanatizing ∙ eutherapeutic eutrophicated

14 letters

Eucentrosaurus eucharistizing eucryphiaceous eudemonistical ∙ eudicotyledons ∙ eugeosynclinal ∙ eugeosynclines ∙ euhydrophilous eulogistically ∙ euneirophrenia Euoplocephalus eupatoriaceous euphausiaceans ∙ euphonicalness euphoniousness ∙ euphorbiaceous ∙ euphototropism euphuistically ∙ eurocurrencies ∙ Eusthenopteron eustrongylides eutrophication ∙

15 letters

eucalyptography eucharistically euchlorophyceae eudaemonistical ∙ eudiometrically ∙ eulamellibranch euphemistically ∙ eurithermophile europeanization eurypharyngidae euryprognathous eurythermophile eurythermophily eutrophications ∙

16 letters

eudemonistically euhemeristically eurithermophilic eurythermophilic

17 letters

eudaemonistically eulamellibranchia eurithermophilous

18 letters

Eustreptospondylus

19 letters

eulamellibranchiata eulamellibranchiate

Words with a ∙ are valid Scrabble words (SOWPODS word list)