16 letters
- hardhandednesses25
- hardheadednesses24
- harmoniousnesses24
- hendecasyllables31
- hepatopancreases28
- hepatotoxicities31
- heterozygosities31
- hexachlorethanes34
- hexachlorophenes37
- highhandednesses28
- histochemistries26
- histopathologies26
- historicalnesses23
- historiographies25
- hydrophilicities30
- hydrophobicities32
- hydroxylapatites34
- hygroscopicities31
- hyperawarenesses27
- hypersexualities32
- hypersomnolences32
- hyperviscosities30
- hypervitaminoses31
- hypophysectomies36
- idolatrousnesses20
- illimitabilities25
- illiteratenesses19
- imaginablenesses27
- immoderatenesses24
- immunogenicities30
- immunosuppresses31
- impassablenesses27
- imperativenesses27
- impermeabilities29
- imperviousnesses28
- implausibilities28
- impossiblenesses27
- impracticalities29
- impregnabilities29
- impressibilities26
- impressivenesses27
- inadequatenesses29
- inadvisabilities26
- inalienabilities23
- inalterabilities22
- inappositenesses24
- inauthenticities24
- incautiousnesses23
- incestuousnesses23
- incommensurables32
- incompletenesses28
- incrediblenesses26
- indecisivenesses26
- indecorousnesses23
- indefinabilities26
- indefinitenesses23
- indelicatenesses23
- indigenousnesses23
- indiscreetnesses22
- indistinctnesses23
- indivisibilities26
- indomitabilities25
- indubitabilities26
- ineffectualities28
- ineluctabilities26
- inevitablenesses26
- inexorablenesses29
- infectiousnesses25
- inflammabilities31
- inflexiblenesses33
- infrangibilities27
- ingloriousnesses22
- ingressivenesses24
- inheritabilities23
- inimitablenesses25
- iniquitousnesses29
- innovativenesses27
- inordinatenesses20
- insatiablenesses22
- inscrutabilities25
- insensiblenesses23
- inseparabilities24
- insignificancies30
- intangiblenesses25
- intellectualizes33
- intensionalities20
- intentionalities20
- intercommunities28
- interdependences27
- interferometries23
- interfertilities21
- intersexualities26
- intersterilities18
- intolerabilities22
- intolerantnesses20
- intractabilities24
- intransitivities22
- invaluablenesses28
- invinciblenesses30
- inviolablenesses27
- irreducibilities25
- irrefutabilities24
- irremovabilities27
- irresolutenesses19
- irrevocabilities27
- justiciabilities33
- justifiabilities33
- lamentablenesses26
- lasciviousnesses26
- leukodystrophies30
- libidinousnesses24
- licentiousnesses23
- localizabilities34
- longheadednesses25
- loquaciousnesses32
- lugubriousnesses26
- machineabilities29
- malodorousnesses23
- manageablenesses27
- manipulabilities29
- meaningfulnesses29
- meddlesomenesses26
- meditativenesses25
- megagametophytes33
- megasporogeneses27
- mendaciousnesses26
- metapsychologies32
- methamphetamines33
- methodicalnesses27
- methylcelluloses31
- methylphenidates31
- meticulousnesses26
- microcircuitries29
- microearthquakes38
- microgametocytes32
- miraculousnesses26
- mischaracterizes36
- monotonousnesses23
- montmorillonites26
- motherlessnesses23
- motionlessnesses22
- multidisciplines30
- mysteriousnesses23
- nanotechnologies27
- neglectfulnesses29
- neighborlinesses26
- neoconservatives29
- nephrotoxicities32
- neurochemistries26
- neuropathologies26
- neuroradiologies22
- newfanglednesses29
- newsworthinesses26
- nonarchitectures27
- nonconservatives30
- nondocumentaries27
- nonindependences29
- noninterferences26
- nonobjectivities37
- nonproprietaries24
- noteworthinesses23
- nutritiousnesses20
- objectlessnesses33
- obsequiousnesses31
- oleaginousnesses22
- oligodendrocytes27
- oligonucleotides26
- oligosaccharides28
- openhandednesses26
- ophthalmoscopies33
- oppressivenesses27
- organophosphates29
- osteoarthritides19
- otolaryngologies25
- outlandishnesses23
- outrageousnesses21
- overcommunicates34
- overgenerosities23
- overorchestrates25
- oxyphenbutazones45
- oxytetracyclines35
- paleogeographies29
- paleopathologies28
- pancreatectomies29
- papillomaviruses32
- paradoxicalities31
- parapsychologies32
- pardonablenesses26
- partridgeberries25
- passionatenesses21
- perceptibilities29
- perceptivenesses30
- percussivenesses28
- peremptorinesses26
- perfectibilities29
- perfectivenesses30
- perfidiousnesses25
- performabilities29
- periodontologies24
- permissibilities26