12 letters
- handednesses18
- hantaviruses20
- harvesttimes21
- hearthstones17
- heartinesses15
- heliolatries16
- hematologies20
- hemihydrates22
- hemodialyses21
- herringbones21
- heteroclites18
- heterocycles23
- heterodoxies22
- heterogamies19
- heterogenies17
- heterogonies17
- heteronomies18
- hexahydrates26
- hexaploidies26
- hiddennesses18
- hierarchizes28
- hippienesses21
- histaminases18
- histogeneses17
- historicizes26
- hoarsenesses15
- hobblebushes27
- hollandaises18
- hollownesses20
- holographies22
- homelinesses19
- homeopathies22
- honeybunches27
- honeysuckles26
- hoodednesses17
- hootenannies17
- hornednesses17
- hornswoggles23
- horridnesses16
- horsefleshes20
- hospitalises18
- hospitalizes27
- hotchpotches27
- housedresses16
- humanenesses20
- humblenesses23
- humbuggeries26
- hungrinesses19
- hydralazines28
- hydrogenases20
- hydrogenates20
- hydrolysates20
- hydrolyzates29
- hydromancies24
- hydropathies22
- hydrospheres22
- hydroxylases27
- hydroxylates27
- hydroxyzines36
- hyoscyamines25
- hyperactives26
- hyperbolizes32
- hypercharges26
- hyperkineses24
- hyperostoses19
- hypersthenes22
- hypodermises23
- hypostatizes28
- hypotensives24
- hypothecates24
- hypothenuses23
- hypothesizes30
- iconolatries17
- ideographies20
- ignobilities19
- illegalities17
- illiteracies17
- illuminances23
- imbecilities22
- immaculacies26
- immaturities19
- immobilities22
- immoderacies22
- immoralities19
- immortalises19
- immortalizes28
- immunologies23
- impenitences23
- impersonates19
- impishnesses21
- importancies22
- impoverishes24
- impudicities23
- impuissances23
- impurenesses20
- inaccuracies23
- inactivities20
- inadequacies27
- inappetences23
- incapacities22
- incarcerates19
- incarnadines19
- incendiaries18
- incentivizes30
- incertitudes18
- incessancies20
- incipiencies23
- incivilities21
- inclemencies24
- incoherences22
- incorporates19
- incriminates20
- incumbencies27
- incurvatures22
- indefinables22
- indelicacies21
- individuates20
- indivisibles22
- indocilities18
- inefficacies25
- inequalities24
- inexistences24
- infanticides21
- infantilizes27
- infelicities20
- infidelities18
- inflammables27
- infrequences30
- ingratitudes17
- ingurgitates18
- inheritances19
- inheritrices18
- inheritrixes22
- inhumanities20
- innatenesses15
- innumeracies21
- insanenesses15
- insecticides20
- insectivores20
- insecurities17
- insentiences18
- inseparables20
- insipidities17
- insistencies17
- insobrieties16
- insolvencies22
- insouciances21
- instantiates14
- insularities15
- insurgencies20
- intactnesses17
- intentnesses15
- intercalates17
- interchanges21
- intercourses17
- intercrosses16
- interiorises13
- interiorizes22
- intermarries16
- intermeddles19
- intermingles20
- internalises15
- internalizes24
- interpolates17
- interrelates14
- interrogates15
- interspecies19
- intersperses16
- interviewees20
- intolerances18
- intraspecies19
- invalidities19
- inventresses18
- investigates19
- investitures18
- inveteracies20
- invitatories17
- inwardnesses18
- iridescences20
- irrelevances21
- irreverences20
- isobutylenes20
- itinerancies17
- jackanapeses32
- jackasseries28
- jaggednesses27
- jauntinesses24
- jejunenesses33
- jocosenesses25
- jocularities26
- joyfulnesses29
- joyousnesses25
- judicatories26
- juvenilities28
- karyokineses23
- keratotomies19
- kilocalories21
- kindlinesses20
- kinetochores22
- kinetoscopes23