17 letters
- prohibitivenesses30
- promiscuousnesses29
- proportionalities25
- provincialization39
- provocativenesses32
- pseudoclassicisms32
- pseudopregnancies32
- psychobiographers37
- psychobiographies37
- psychodynamically41
- psycholinguistics35
- psychopathologies35
- psychopathologist35
- psychophysiologic40
- psychosexualities36
- psychosomatically37
- psychotherapeutic36
- punctiliousnesses28
- pyroelectricities29
- pyrometallurgical34
- quadricentennials35
- quatercentenaries32
- quattuordecillion35
- radioautographies26
- radiobiologically31
- radiochromatogram31
- radioimmunoassays28
- radioisotopically28
- radiotelegraphies26
- rationalistically26
- recapitalizations34
- recentralizations32
- reclassifications28
- recognizabilities36
- reconceptualizing41
- reconcilabilities29
- reconstructionism29
- reconstructionist26
- recontextualizing42
- recrystallization34
- redistributionist23
- refrangiblenesses28
- rehospitalization33
- reindustrializing33
- reinterpretations22
- rememberabilities30
- remilitarizations31
- renationalization30
- repetitiousnesses22
- reprehensibleness28
- reproducibilities29
- resolidifications26
- responsiblenesses26
- restrictivenesses25
- retransformations25
- retroperitoneally25
- revascularization36
- revolutionariness25
- rhynchocephalians37
- ribonucleoprotein30
- roentgenographies28
- rudimentarinesses24
- rumbustiousnesses27
- saccharifications32
- sanctimoniousness27
- scandalmongerings32
- schizophrenically44
- semiautomatically31
- semiconsciousness29
- semidocumentaries29
- semidomestication28
- semipornographies31
- semiprofessionals28
- sententiousnesses21
- serviceablenesses29
- sesquicentenaries32
- sesquicentennials34
- socioeconomically34
- spectroheliograms31
- spectroheliograph33
- spectrohelioscope32
- spectroscopically36
- spiritualizations32
- splendiferousness28
- standoffishnesses28
- stereochemistries25
- stereomicroscopes29
- stereomicroscopic32
- stereospecificity31
- straightforwardly31
- straightjacketing40
- straitlacednesses23
- structuralization33
- subcategorization36
- subclassification32
- subjectivizations47
- subordinatenesses24
- substantialnesses24
- substantivenesses27
- superbillionaires27
- supercivilization39
- superconductivity36
- superconservative33
- supercorporations28
- superefficiencies34
- superfecundations31
- superheavyweights36
- superintellectual29
- superintelligence30
- superintendencies28
- superlativenesses27
- supermillionaires27
- superminicomputer35
- supernaturalistic27
- superplasticities28
- superregenerative28
- superromanticisms31
- superspeculations30
- suppressibilities28
- suppressivenesses29
- supranationalisms27
- supranationalists24
- susceptiblenesses29
- symmetricalnesses30
- symptomatological35
- technicalizations37
- telecommunication33
- teleconferencings32
- telephotographies30
- temerariousnesses22
- temporomandibular33
- tendentiousnesses22
- teratocarcinomata27
- theatricalization33
- thermochemistries30
- thermodynamically36
- thermodynamicists32
- thermoelectricity31
- thermographically36
- thermoluminescent32
- thermoperiodicity31
- thermoregulations27
- thermostabilities26
- thrombocytopenias34
- tightfistednesses26
- tintinnabulations26
- totalitarianizing31
- transcendentalism28
- transcendentalist25
- transcriptionally29
- transcriptionists25
- transdisciplinary29
- transferabilities25
- transgenerational23
- transilluminating28
- transillumination26
- transilluminators25
- transistorization28
- translatabilities23
- transnationalisms24
- transplantability29
- transthoracically30
- transubstantiated24
- transubstantiates23
- triboluminescence33
- trichloroethylene29
- tridimensionality26
- trigonometrically30
- triiodothyronines24
- triphenylmethanes32
- triskaidekaphobia34
- trustworthinesses24
- turbidimetrically32
- ultracentrifuging32
- ultraconservatism30
- ultraconservative31
- ultraminiaturized34
- ultranationalisms25
- ultranationalists22
- ultraprofessional27
- ultraprogressives28
- ultrasonographies27
- unacceptabilities32
- unanswerabilities27
- unapproachability36
- unassailabilities24
- unceremoniousness28
- unchangeabilities31
- unclimbablenesses34
- uncompetitiveness33
- uncomprehendingly38
- unconscionability33
- unconsciousnesses28
- uncontrollability31
- uncontroversially31
- unconventionality32
- undemonstratively31
- underachievements33
- undernourishments28
- understandability28