15 letters
- prestigiousness22
- presuppositions26
- presynaptically31
- pretentiousness21
- preterminations23
- prettifications25
- primitivenesses26
- prioritizations28
- problematically32
- procrastinating25
- procrastination23
- procrastinators22
- profitabilities25
- prognosticating27
- prognostication25
- prognosticative28
- prognosticators24
- progressivistic27
- progressivities24
- prohibitionists24
- prohibitiveness28
- promotabilities25
- promotivenesses26
- pronunciational26
- proportionality25
- proportionately25
- proportionating25
- proprioceptions28
- proselytization31
- prosthodontists22
- proteolytically28
- provincialities27
- provocativeness30
- prussianization30
- pseudoscientist24
- psychoacoustics32
- psychoneurotics30
- psychotomimetic34
- punctiliousness26
- punishabilities26
- pusillanimities25
- quadruplicating37
- quadruplication35
- quadruplicities34
- quantifications33
- quintuplicating37
- radicalizations30
- radioactivities23
- radioprotection23
- radioprotective26
- radiostrontiums21
- rationalization27
- reacclimatizing37
- reaccreditation23
- reactionaryisms24
- reafforestation22
- reapportionment26
- reappropriating27
- reasonabilities20
- reauthorization28
- recallabilities24
- recanalizations30
- recapitulations24
- receptivenesses26
- recertification25
- recodifications26
- recolonizations30
- recombinational27
- recommendations27
- reconcentrating26
- reconcentration24
- reconciliations24
- reconfiguration26
- reconfirmations26
- reconsecrations23
- reconsideration21
- reconsolidating24
- reconstitutions21
- reconstructible27
- reconstructions24
- recontaminating26
- recontamination24
- redetermination21
- redintegrations20
- redistillations19
- redistributions21
- reductivenesses25
- reduplicatively31
- reeligibilities22
- reformabilities25
- refortification25
- refundabilities25
- regionalization29
- regularizations29
- rehabilitations22
- reimplantations24
- reincorporating25
- reincorporation23
- reinstallations19
- reintroductions22
- reinvestigating25
- reinvestigation23
- reinvigorations23
- remediabilities23
- remobilizations32
- remonetizations29
- remonstratively26
- renationalizing30
- renormalization30
- reorchestrating23
- reorchestration21
- reorganizations28
- repairabilities22
- repeatabilities22
- repetitiousness20
- replicabilities26
- repolarizations29
- representations20
- representatives23
- repristinations20
- reprivatization32
- repudiationists21
- requalification33
- reregistrations18
- resectabilities22
- reservationists20
- resistibilities19
- resistivenesses20
- resocialization29
- restrictionisms22
- restrictionists19
- restrictiveness23
- resurrectionist20
- resystematizing32
- retentivenesses21
- retinoblastomas23
- retroactivities22
- retrogradations19
- retroreflection23
- retroreflective26
- retrospectively28
- revalorizations30
- reversibilities23
- revisualization31
- revitalizations30
- revivifications30
- revolutionaries22
- revolutionarily25
- revolutionising25
- revolutionizers31
- revolutionizing34
- ribonucleotides25
- rigidifications25
- ritualistically24
- romanticization32
- rumbustiousness25
- sacrosanctities22
- sadomasochistic27
- sanctifications26
- sanctimoniously27
- saponifications26
- saprogenicities24
- saprophytically32
- schematizations33
- scintillometers24
- sclerotizations29
- secretivenesses23
- secularizations30
- securitizations29
- seditiousnesses18
- seductivenesses25
- segregationists20
- selectivenesses24
- semiabstraction25
- semiretirements22
- sensationalised19
- sensationalises18
- sensationalisms21
- sensationalists18
- sensationalized28
- sensationalizes27
- sensitivenesses21
- sensualizations28
- sententiousness19
- sentimentalised22
- sentimentalises21
- sentimentalisms24
- sentimentalists21
- sentimentalized31
- sentimentalizes30
- sidesplittingly26
- silicifications26
- simplifications29
- sinterabilities20
- socialistically26
- sociolinguistic26
- solderabilities21
- solidifications24
- solipsistically26
- solubilizations31