15 letters
- presuppositions26
- pretentiousness21
- preterminations23
- prettifications25
- prioritizations28
- procrastination23
- professionalism26
- professionalize32
- prognostication25
- prohibitionists24
- pronunciational26
- proportionality25
- proportionately25
- proportionating25
- proprioceptions28
- proselytization31
- prussianization30
- pseudoscorpions27
- psychobiography37
- psychobiologies31
- psychobiologist31
- punctiliousness26
- quadruplication35
- quantifications33
- radicalizations30
- radioactivities23
- radioautographs24
- radioautography26
- radiobiological26
- radiobiologists22
- radiochemically31
- radiometrically26
- radioprotection23
- radioprotective26
- radiostrontiums21
- radiotelegraphs24
- radiotelegraphy26
- radiotelemetric23
- radiotelephones23
- radiotherapists21
- rapaciousnesses23
- rationalization27
- reaccreditation23
- reactionaryisms24
- reafforestation22
- reapportionment26
- reauthorization28
- recanalizations30
- recapitulations24
- recertification25
- recodifications26
- recolonizations30
- recombinational27
- recommendations27
- recommissioning28
- reconcentration24
- reconciliations24
- reconfiguration26
- reconfirmations26
- reconsecrations23
- reconsideration21
- reconstitutions21
- reconstructions24
- recontamination24
- redetermination21
- redintegrations20
- redistillations19
- redistributions21
- refortification25
- regionalization29
- regularizations29
- rehabilitations22
- reimplantations24
- reincorporation23
- reinstallations19
- reintroductions22
- reinvestigation23
- reinvigorations23
- religiousnesses20
- remobilizations32
- remonetizations29
- renationalizing30
- renormalization30
- reorchestration21
- reorganizations28
- repetitiousness20
- repolarizations29
- representations20
- repristinations20
- reprivatization32
- repudiationists21
- requalification33
- reregistrations18
- reservationists20
- resocialization29
- restrictionisms22
- restrictionists19
- resurrectionist20
- retransmissions20
- retrogradations19
- retroreflection23
- revalorizations30
- revisualization31
- revitalizations30
- revivifications30
- revolutionaries22
- revolutionarily25
- revolutionising25
- revolutionizers31
- revolutionizing34
- rigidifications25
- romanticization32
- rumbustiousness25
- sagaciousnesses22
- salaciousnesses21
- sanctifications26
- sanctimoniously27
- saponifications26
- schematizations33
- sclerotizations29
- secularizations30
- securitizations29
- seditiousnesses18
- segregationists20
- semiabstraction25
- sensationalised19
- sensationalises18
- sensationalisms21
- sensationalists18
- sensationalized28
- sensationalizes27
- sensualizations28
- sententiousness19
- septendecillion26
- seroconversions24
- silicifications26
- simplifications29
- sociobiological28
- sociobiologists24
- socioculturally28
- sociohistorical24
- sociolinguistic26
- solidifications24
- solubilizations31
- somnambulations28
- sophistications24
- specialisations23
- specializations32
- sporangiophores26
- standardization28
- stigmatizations30
- stoichiometries23
- stratifications22
- stultifications24
- subinfeudations26
- suboptimization35
- suborganization32
- subprofessional27
- subreptitiously26
- substantiations21
- substitutionary23
- suburbanization34
- subvocalization37
- superannuations23
- superelevations25
- supererogations22
- superimposition26
- superinductions26
- superinfections27
- supernutritions22
- superovulations26
- superpatriotism25
- supersaturation21
- superscriptions26
- superstitiously23
- supplementation28
- surreptitiously23
- syllabification29
- symmetrizations33
- synchronisation25
- synchronization34
- systematization30
- tatterdemalions21
- temerariousness20
- tenaciousnesses21
- tendentiousness20
- tergiversations22
- thermalizations31
- thermojunctions35
- thermoperiodism27
- traditionalisms21
- traditionalists18
- traditionalized28
- traditionalizes27
- transaminations21
- transcriptional24
- transfiguration23
- transformations23
- transliteration18
- transmigrations22