14 letters
- interspersions19
- intersterility18
- interstitially19
- intertextually27
- intertwinement23
- intervalometer23
- intervertebral23
- intimatenesses19
- intussuscepted24
- irresoluteness17
- isoproterenols19
- kapellmeisters26
- kindergartener23
- lateralization26
- lepidopterists22
- letterspacings24
- lightheartedly25
- lignosulfonate24
- literalization26
- literarinesses16
- literatenesses16
- luteinizations27
- macroaggregate26
- maladministers23
- malcontentedly27
- masterlinesses19
- materialnesses19
- megakaryocytes30
- metaphosphates27
- metempsychoses30
- metempsychosis30
- metencephalons28
- meteoriticists20
- meteorological24
- meteorologists20
- microcassettes23
- microcomputers30
- micrometeorite23
- micrometeoroid24
- microsporocyte28
- microtechnique36
- misappropriate26
- misarticulated23
- misarticulates22
- misinterpreted22
- misregistering22
- misrepresented22
- moderatenesses19
- monounsaturate21
- multicharacter27
- multilaterally24
- multinucleated26
- multiparameter25
- multipotential24
- mysteriousness21
- nanotechnology27
- nonattendances22
- nonbarbiturate23
- noncomplicated30
- nondegenerates20
- nonelectrolyte23
- nonexistential25
- nonhalogenated23
- noninteracting23
- noninteractive24
- nonintercourse21
- nonterminating23
- nonthreatening22
- noteworthiness21
- nucleoproteins24
- obduratenesses20
- obsoletenesses19
- omnicompetence31
- oppositenesses21
- orthophosphate26
- ostentatiously19
- osteoarthritic19
- osteoarthritis16
- osteosarcomata20
- outdatednesses18
- outmanipulated25
- outmanipulates24
- overabstracted25
- overaccentuate26
- overarticulate23
- overattentions20
- overcompensate28
- overcomplicate31
- overdetermined24
- overdiscounted25
- overdocumented28
- overelaborated23
- overelaborates22
- overexaggerate29
- overextensions27
- overornamented24
- overprotecting27
- overprotection25
- overprotective28
- overspeculated27
- overspeculates26
- overstatements22
- overstimulated24
- overstimulates23
- oversweetening25
- overtightening26
- oystercatchers24
- pamphleteering29
- pancreatectomy29
- parameterizing32
- passementeries21
- passionateness19
- pasteurization28
- pectinesterase21
- penitentiaries19
- philatelically28
- phosphoprotein28
- phosphorylated28
- phosphorylates27
- photodetectors23
- photoduplicate28
- photosynthates24
- phytoplankters30
- polycarbonates27
- portentousness20
- postcollegiate24
- postdebutantes23
- posteriorities17
- posterolateral19
- postexperience31
- postmastectomy28
- postmastership25
- posttensioning22
- potentialities19
- potentiometers21
- potentiometric24
- preconstructed26
- predeterminers22
- predetermining25
- preinterviewed26
- premeditatedly25
- preponderately25
- preposterously24
- preregistering22
- presbyterially26
- presentencings25
- presterilizing30
- pretensionless20
- pretermination22
- pretermissions21
- procrastinated22
- procrastinates21
- professoriates20
- prognosticated24
- prognosticates23
- proportionated22
- proportionates21
- protectionisms24
- protectionists21
- protectiveness25
- protectorships25
- pteridological25
- pteridologists21
- pyrheliometers25
- pyrophosphates29
- quadrilaterals27
- quadrumvirates33
- quadruplicated34
- quadruplicates33
- quarterbacking37
- quartermasters27
- quincentennial32
- quintessential27
- quintuplicated34
- quintuplicates33
- radiotelegraph23
- radiotelemetry21
- radiotelephone22
- radiotelephony24
- reappropriated24
- reappropriates23
- reconcentrated23
- reconcentrates22
- reconnoitering22
- reconsolidated21
- reconsolidates20
- recontaminated23
- recontaminates22
- redintegrating21
- redintegration19
- redintegrative22
- reencountering23
- reflectometers24
- refractometers23
- regenerateness18
- reincorporated22
- reincorporates21
- reinstatements19
- reintegrations18
- reinterpreting21