16 letters
- insufferableness29
- intellectualizer33
- interassociation21
- intercalibration25
- interchromosomal29
- intercommunicate31
- intercommunities28
- intercomparisons27
- interconnections26
- intercontinental24
- interconversions26
- interconvertible29
- intercorrelating24
- intercorrelation22
- intercrystalline25
- interdependences27
- interdependently27
- interdigitations21
- interferometries23
- interfertilities21
- intergenerations21
- intergradational22
- interhemispheric30
- interinfluencing30
- interiorizations27
- interjectionally34
- intermediateness22
- interminableness26
- interministerial22
- intermissionless22
- intermodulations24
- intermolecularly29
- internalizations29
- internationalise20
- internationalism23
- internationalist20
- internationality22
- internationalize29
- interoperability26
- interpenetrating24
- interpenetration22
- interpretability26
- interpretational22
- interpretatively27
- interrelatedness20
- intersexualities26
- intersterilities18
- interstimulation23
- interstratifying25
- interterritorial18
- intertestamental22
- interventionisms26
- interventionists23
- interventricular27
- intervisitations22
- intervocalically32
- intolerabilities22
- intolerantnesses20
- invulnerableness29
- landlubberliness29
- macrolepidoptera30
- maladministering28
- malpractitioners27
- materializations30
- meretriciousness24
- meristematically29
- microcalorimeter29
- microlepidoptera30
- microphotometers30
- mischaracterized37
- mischaracterizes36
- misunderstanding27
- motherlessnesses23
- multilateralisms26
- multilateralists23
- mysteriousnesses23
- neoconservatisms28
- neoconservatives29
- neurotransmitter22
- nonconservations27
- nonconservatives30
- noncontroversial27
- nondeterministic26
- nonentertainment24
- noninterferences26
- noninterventions25
- nonmaterialistic25
- nonproliferation26
- northeasternmost23
- northwesternmost26
- obstreperousness24
- oligomerizations32
- operationalistic24
- organomercurials27
- otherworldliness25
- overaccentuating31
- overachievements33
- overapplications31
- overarticulating28
- overcapitalizing39
- overcentralizing37
- overcommunicated35
- overcommunicates34
- overcompensating33
- overcompensation31
- overcompensatory32
- overcomplicating36
- overconservative32
- overconstructing31
- overconsumptions32
- overcultivations30
- overdevelopments33
- overelaborations25
- overembellishing33
- overenthusiastic27
- overexaggerating34
- overexaggeration32
- overexpectations34
- overexploitation32
- overgeneralizing36
- overgenerosities23
- overhomogenizing40
- overindebtedness27
- overorchestrated26
- overorchestrates25
- overprescription30
- overproportioned28
- overspecializing39
- overspeculations29
- overstimulations26
- oversubscription31
- overutilizations32
- parameterization32
- partridgeberries25
- perceptibilities29
- perceptivenesses30
- percussivenesses28
- peremptorinesses26
- perfectibilities29
- perfectivenesses30
- perfidiousnesses25
- performabilities29
- periodontologies24
- periphrastically31
- permissibilities26
- permissivenesses27
- perniciousnesses25
- perpendicularity31
- personablenesses25
- personalizations31
- personifications27
- persuasivenesses25
- pertinaciousness25
- phosphoglycerate34
- photointerpreter25
- photomultipliers30
- photopolarimeter28
- photosensitizers31
- phototypesetters26
- phrasemongerings30
- physiotherapists28
- phytogeographers32
- polydispersities26
- postexperimental34
- precertification29
- predetermination25
- prekindergartens28
- preposterousness24
- preregistrations22
- prerevolutionary28
- preservabilities27
- preservationists24
- propertylessness26
- prosperousnesses24
- psychobiographer36
- psychotherapists31
- quarterfinalists31
- quasiperiodicity35
- recertifications26
- reconsiderations22
- recoverabilities27
- redeterminations22
- referentialities21
- regeneratenesses20
- reinterpretation21
- remunerativeness26
- scandalmongering31
- sclerenchymatous32
- semiconservative31
- semigovernmental31
- semipermeability31
- semisubmersibles30
- seronegativities23
- seropositivities23
- serviceabilities27
- slanderousnesses21
- slatternlinesses20
- sobersidednesses22
- soporiferousness24
- southeasternmost23