14 letters
- oversweetening25
- overtightening26
- overtreatments22
- overvaluations25
- overwhelmingly33
- oystercatchers24
- pachydermatous29
- pamphleteering29
- parameterizing32
- partridgeberry25
- passementeries21
- passionflowers25
- pectinesterase21
- perambulations26
- perceptibility29
- perceptiveness28
- perceptivities27
- percussionists22
- percussiveness26
- percutaneously26
- peregrinations21
- peremptoriness24
- perfectibility29
- perfectionisms27
- perfectionists24
- perfectiveness28
- perfectivities27
- perfidiousness23
- performability29
- pericarditides22
- perilousnesses20
- periodizations28
- periodontology24
- perissodactyls24
- peritrichously26
- permeabilities24
- permissibility26
- permissiveness25
- permittivities24
- perniciousness23
- perpendiculars27
- perseverations22
- personableness23
- perspicacities26
- persuasiveness23
- pertinaciously25
- perturbational23
- perversenesses22
- perviousnesses23
- pettifoggeries24
- philosophizers34
- photocomposers28
- photoengravers26
- photofinishers25
- photoperiodism26
- phycoerythrins29
- physiographers28
- phytoplankters30
- plasmaphereses26
- plasmapheresis26
- poikilothermic30
- polydispersity26
- polymerisation24
- polymerization33
- posteriorities17
- posterolateral19
- postexperience31
- postliberation22
- postmastership25
- postmodernisms25
- postmodernists22
- potentiometers21
- predeterminers22
- predetermining25
- prediscoveries25
- preexperiments31
- preferentially25
- preinterviewed26
- preoperational22
- preoperatively27
- preperformance30
- preponderances26
- preponderantly26
- preponderately25
- preponderating25
- preponderation23
- preposterously24
- preregistering22
- preretirements21
- prerevisionist22
- presbyterially26
- preservability27
- presterilizing30
- pretermination22
- pretermissions21
- proliferations22
- propagandizers33
- prosperousness22
- psychobabblers34
- pteridological25
- pteridologists21
- pulverizations33
- pyrheliometers25
- quadrilaterals27
- quarterbacking37
- quartermasters27
- radiotherapies20
- radiotherapist20
- reaccelerating24
- reconnoitering22
- recoverability27
- reembroidering24
- reencountering23
- reexperiencing31
- referentiality21
- reflectometers24
- refractometers23
- refrigerations20
- regenerateness18
- reinnervations21
- reinterpreting21
- reinterviewing25
- remanufacturer26
- rematerialized28
- rematerializes27
- remuneratively26
- reregistration17
- reservationist19
- reservednesses20
- retransferring21
- reupholstering24
- reverberations22
- revolutionizer30
- rumormongering27
- rutherfordiums25
- sabermetrician24
- saccharimeters25
- saccharometers25
- sacerdotalisms22
- sacerdotalists19
- scandalmongers26
- scatterbrained22
- schlockmeister30
- schoolmasterly26
- schoolteachers25
- scintillometer23
- sclerenchymata29
- scleroproteins22
- sclerotization28
- seismographers24
- semicommercial30
- sempiternities21
- serializations25
- sericulturists20
- seriocomically27
- seroconversion23
- serodiagnostic21
- seronegativity23
- seropositivity23
- serotoninergic21
- serviceability27
- serviceberries24
- servomechanism30
- sesquiterpenes28
- severabilities22
- shellfisheries23
- silversmithing27
- sinisternesses16
- skullduggeries27
- slanderousness19
- slatternliness18
- slaughterhouse23
- slaughterously24
- sledgehammered27
- slipperinesses22
- snippersnapper28
- sobersidedness20
- soteriological21
- southernnesses19
- spermatogonial24
- spermatogonium27
- spermatophores25
- spermatophytes27
- spermatophytic30
- spermiogeneses23
- spermiogenesis23
- sportfisherman26
- sportfishermen26
- stadtholderate19
- stationmasters18
- steamrollering22
- steeplechasers23
- stereochemical26
- stereographies21
- stereographing24
- stereoisomeric20
- stereospecific26
- sterilizations25
- sterlingnesses19
- stockbrokerage30