18 letters
- microreproductions33
- mineralocorticoids30
- misclassifications32
- misidentifications30
- monochromaticities33
- mucopolysaccharide40
- multicellularities30
- neuroendocrinology31
- neuropharmacologic37
- neurophysiological34
- neuropsychiatrists30
- neuropsychological37
- neuropsychologists33
- nonanthropological33
- noncommutativities34
- noncomparabilities33
- nonconfrontational30
- noncooperationists27
- nondeductibilities30
- nondestructiveness30
- nondiscriminations29
- noninterchangeable33
- ophthalmologically39
- orthopsychiatrists30
- oscillographically37
- overcapitalization39
- overcentralization37
- overclassification33
- overcommercialized45
- overcommercializes44
- overcommunications37
- overconcentrations31
- overidentification31
- overoptimistically35
- overprotectiveness33
- oversimplification36
- overspecialization39
- ovolactovegetarian33
- paleoclimatologies32
- paleoclimatologist32
- particularizations36
- pathophysiological37
- pentachlorophenols35
- perchloroethylenes33
- perpendicularities31
- pertinaciousnesses27
- phenomenologically38
- pheochromocytomata39
- phonocardiographic38
- phosphoglucomutase39
- photodecomposition34
- photodissociations28
- photomicrographies36
- photoreactivations31
- photoreproductions32
- photosynthetically35
- physiopathological37
- piezoelectricities37
- polyacrylonitriles32
- polychromatophilia38
- polychromatophilic41
- polyesterification31
- polymorphonuclears38
- polyribonucleotide34
- postpsychoanalytic38
- pronounceabilities31
- propagandistically35
- provincializations40
- pseudoparenchymata37
- pseudotuberculoses32
- pseudotuberculosis32
- psychoanalytically39
- psychobiographical42
- psychopathological40
- psychopathologists36
- psychopharmacology44
- psychophysiologies38
- psychophysiologist38
- quantificationally40
- quasiperiodicities35
- quattuordecillions36
- radiochromatograms32
- rambunctiousnesses31
- rechromatographies33
- rechromatographing36
- reconstructionisms30
- reconstructionists27
- recrystallizations35
- revascularizations37
- rhabdomyosarcomata35
- ribonucleoproteins31
- roentgenologically32
- sacrilegiousnesses26
- satisfactorinesses25
- sedimentologically33
- semiconservatively36
- semidomestications29
- sociopsychological38
- somnambulistically37
- spectrofluorimeter32
- spectrofluorometer32
- spectrofluorometry34
- spectrographically38
- spectroheliographs34
- spectroheliography36
- spectrohelioscopes33
- spectrophotometers32
- spectrophotometric35
- stereophotographic33
- stereospecifically34
- stoichiometrically33
- structuralizations34
- subcategorizations37
- subclassifications33
- subconsciousnesses31
- submicroscopically41
- superciliousnesses28
- supercivilizations40
- superconglomerates32
- superintellectuals30
- superintelligences31
- superminicomputers36
- supersophisticated31
- tachistoscopically36
- telecommunications34
- theatricalizations34
- thermoluminescence36
- thermoplasticities30
- transcendentalisms29
- transcendentalists26
- transmogrification31
- triboelectricities28
- triboluminescences34
- trichloroethylenes30
- ultracentrifugally34
- ultraconservatisms31
- ultraconservatives32
- ultramicroscopical36
- ultranationalistic26
- ultrasophisticated29
- unaccountabilities32
- unattractivenesses28
- unchangeablenesses33
- uncharitablenesses30
- uncompromisingness36
- unconscionableness33
- unconstitutionally30
- unconvincingnesses36
- unenthusiastically31
- ungrammaticalities32
- unpredictabilities31
- unprinciplednesses33
- unsatisfactoriness27
- unscrupulousnesses31
- videoconferencings37