14 letters
- noncooperators22
- nonexplanatory30
- nonfilamentous25
- nonsecretories19
- octodecillions24
- odontoglossums23
- onomatologists21
- oophorectomies25
- optoelectronic25
- osmoregulatory23
- otolaryngology25
- ovariectomized34
- oversolicitous23
- pachydermatous29
- paleontologies22
- paleontologist22
- pancreatectomy29
- parasitologies20
- parasitologist20
- parenchymatous29
- pastoralnesses19
- pentobarbitals25
- pentobarbitone25
- peremptoriness24
- periodontology24
- phenobarbitone27
- photoautotroph25
- photobiologies25
- photobiologist25
- photochemistry29
- photochromisms30
- photocomposers28
- photocomposing31
- photodetectors23
- photoduplicate28
- photoelectrons24
- photoemissions23
- photoengravers26
- photoengraving29
- photofinishers25
- photofinishing28
- photogenically29
- photogeologies24
- photogeologist24
- photogrammetry29
- photoinduction26
- photoinductive29
- photolytically29
- photooxidation28
- photooxidative31
- photooxidizing39
- photoperiodism26
- photoreactions23
- photoreception26
- photoreceptive29
- photoreceptors25
- photoreduction25
- photosensitive24
- photosensitize29
- photosynthates24
- photosyntheses24
- photosynthesis24
- photosynthetic27
- phytochemistry31
- phytogeography32
- phytopathogens29
- phytopathology31
- phytoplankters30
- phytoplanktons31
- phytosociology29
- pictorializing33
- pinealectomies25
- pinealectomize34
- planetological26
- planetologists22
- plastoquinones30
- pneumatologies25
- pneumatophores27
- polytonalities22
- portentousness20
- postcopulatory27
- postmastectomy28
- precentorships26
- preceptorships28
- predestinators19
- presymptomatic31
- pretournaments23
- primatological27
- primatologists23
- procrastinator21
- prognosticator23
- pronunciamento27
- proprietorship25
- proprioceptors26
- protectorships25
- protohistorian20
- protohistories19
- protolanguages24
- protoplanetary24
- protoporphyrin28
- prototypically29
- protozoologies29
- protozoologist29
- radioautograph23
- recommendatory27
- reconciliatory24
- reconstructors22
- reflectometers24
- reflectorizing33
- refractometers23
- refractometric26
- refractoriness21
- rehabilitators20
- reinvigorators21
- rephotographed27
- retinoblastoma22
- retroreflector21
- rheumatologies23
- rheumatologist23
- satisfactorily23
- sedimentologic25
- semiautomatics24
- semiautonomous23
- semiconductors26
- sensitometries18
- serotoninergic21
- snaggletoothed23
- solicitorships23
- solicitousness20
- somatotrophins23
- spectatorships25
- spermatogonial24
- spermatogonium27
- spermatophores25
- spermatophytes27
- spermatophytic30
- splenectomized35
- splenectomizes34
- stapedectomies24
- steppingstones24
- stochastically26
- stockbrokerage30
- stoichiometric25
- stonemasonries19
- stoutheartedly21
- stratovolcanos23
- streptobacilli25
- streptokinases22
- streptomycetes25
- streptothricin23
- subcontractors25
- superconductor27
- supererogatory22
- symptomatology30
- tachistoscopes25
- tachistoscopic28
- tautologically25
- teratogenicity22
- tergiversators20
- territorialism18
- territorialist15
- territoriality17
- territorialize24
- tetragrammaton23
- thanatological24
- thanatologists20
- thermoreceptor25
- thymectomizing39
- thyrotoxicoses28
- thyrotoxicosis28
- togethernesses19
- toilsomenesses19
- tolerabilities19
- tonelessnesses17
- toothbrushings25
- toploftinesses22
- tortoiseshells18
- tortuousnesses17
- towardlinesses20
- toxigenicities27
- tracheostomies22
- transistorised16
- transistorises15
- transistorized25
- transistorizes24
- transitoriness16
- transmigrators20
- transmigratory22
- treponematoses21
- treponematosis21
- trichotomously26
- turbogenerator21
- ubiquitousness30
- ultramicrotome25
- ultramicrotomy27
- unaccustomedly30
- unsatisfactory24
- untouchability28
- untowardnesses21
- valedictorians24