16 letters
- electrosurgeries23
- electrotherapies25
- elementarinesses22
- encephalopathies31
- endarterectomies24
- endopolyploidies29
- enforceabilities27
- erythroblastoses24
- eschatologically31
- euphoniousnesses25
- evenhandednesses27
- exceptionalities31
- exhaustibilities30
- exhaustivenesses31
- expressionlessly31
- expressivenesses31
- extemporaneities30
- extensionalities26
- extractabilities30
- extraneousnesses26
- extraterrestrial24
- factitiousnesses24
- faintheartedness24
- fallaciousnesses26
- falsifiabilities27
- fantasticalities24
- farfetchednesses29
- farsightednesses25
- fashionabilities26
- fastidiousnesses22
- fathomlessnesses26
- feeblemindedness30
- felicitousnesses25
- fictitiousnesses24
- figurativenesses27
- fissionabilities24
- flagitiousnesses24
- forebodingnesses27
- forehandednesses25
- foreseeabilities23
- formidablenesses28
- forthrightnesses26
- fortuitousnesses22
- fraudulentnesses25
- freehandednesses25
- friendlessnesses23
- futurelessnesses23
- gastroesophageal26
- gastrointestinal21
- gelatinousnesses22
- gluttonousnesses23
- goitrogenicities24
- governmentalizes37
- grammaticalities28
- gratuitousnesses21
- greatheartedness22
- gregariousnesses22
- groundlessnesses23
- gynandromorphies31
- hardhandednesses25
- hardheadednesses24
- harmoniousnesses24
- heavyheartedness28
- hendecasyllables31
- hepatopancreases28
- hepatotoxicities31
- heterozygosities31
- hexachlorethanes34
- hexachlorophenes37
- hexylresorcinols33
- highhandednesses28
- histochemistries26
- histopathologies26
- historicalnesses23
- historiographies25
- hydrophilicities30
- hydrophobicities32
- hydroxylapatites34
- hygroscopicities31
- hyperawarenesses27
- hypercorrectness30
- hypersexualities32
- hypersomnolences32
- hyperviscosities30
- hypervitaminoses31
- hypophysectomies36
- idolatrousnesses20
- illimitabilities25
- illiteratenesses19
- imaginablenesses27
- immeasurableness28
- immoderatenesses24
- immunogenicities30
- immunosuppressed32
- immunosuppresses31
- impassablenesses27
- imperativenesses27
- imperceptiveness33
- imperishableness29
- impermeabilities29
- imperviousnesses28
- implausibilities28
- impossiblenesses27
- impracticalities29
- impregnabilities29
- impressibilities26
- impressivenesses27
- inadequatenesses29
- inadvisabilities26
- inalienabilities23
- inalterabilities22
- inappositenesses24
- inarticulateness23
- inauspiciousness26
- inauthenticities24
- incautiousnesses23
- incestuousnesses23
- incommensurables32
- incommodiousness29
- incompletenesses28
- inconclusiveness31
- inconsolableness27
- incontestability27
- incorrigibleness27
- incrediblenesses26
- indecisivenesses26
- indecorousnesses23
- indefinabilities26
- indefinitenesses23
- indelicatenesses23
- indigenousnesses23
- indiscreetnesses22
- indisputableness27
- indissolubleness25
- indistinctnesses23
- indivisibilities26
- indomitabilities25
- indubitabilities26
- ineffectualities28
- ineluctabilities26
- inevitablenesses26
- inexorablenesses29
- inexplicableness36
- inexpressibility33
- inexpressiveness32
- inexpugnableness36
- infectiousnesses25
- inflammabilities31
- inflexiblenesses33
- infrangibilities27
- ingloriousnesses22
- ingressivenesses24
- inharmoniousness25
- inheritabilities23
- inhospitableness27
- inimitablenesses25
- iniquitousnesses29
- innovativenesses27
- inordinatenesses20
- insatiablenesses22
- inscrutabilities25
- insensiblenesses23
- inseparabilities24
- insignificancies30
- insufferableness29
- intangiblenesses25
- intellectualizes33
- intellectualness25
- intelligibleness26
- intensionalities20
- intentionalities20
- intercommunities28
- interdependences27
- interferometries23
- interfertilities21
- intermediateness22
- interminableness26
- intermissionless22
- interrelatedness20
- intersexualities26
- intersterilities18
- intertestamental22
- intolerabilities22
- intolerantnesses20
- intractabilities24
- intransitiveness23
- intransitivities22
- invaluablenesses28
- invinciblenesses30
- inviolablenesses27
- invulnerableness29
- irreducibilities25
- irrefutabilities24
- irremediableness25
- irremovabilities27
- irrepressibility25
- irresistibleness21
- irresolutenesses19
- irresponsibility26
- irresponsiveness25