16 letters
- permissivenesses27
- perniciousnesses25
- personablenesses25
- persuasivenesses25
- petrochemistries27
- phosphocreatines30
- phosphorescences33
- photochemistries29
- photodissociates25
- photogrammetries29
- photosynthesizes35
- phytochemistries31
- phytoflagellates31
- phytogeographies32
- phytopathologies31
- phytosociologies29
- pleasurabilities25
- polarizabilities33
- polydispersities26
- polyelectrolytes29
- portentousnesses22
- possessivenesses24
- posthumousnesses27
- practicabilities29
- precariousnesses24
- precociousnesses27
- predaceousnesses25
- predictabilities27
- presentabilities24
- preservabilities27
- preventabilities28
- preventivenesses29
- processabilities26
- processibilities26
- prodigiousnesses24
- productivenesses29
- professionalizes33
- profitablenesses27
- pronunciamentoes29
- propitiousnesses24
- prosperousnesses24
- protectivenesses27
- protrusivenesses25
- pseudepigraphies31
- pseudocoelomates28
- pugnaciousnesses28
- purposefulnesses29
- pyelonephritides29
- pyrometallurgies29
- radiochemistries25
- radiotelemetries21
- radiotelephonies24
- rampageousnesses26
- reasonablenesses22
- rebelliousnesses23
- reconceptualizes37
- recontextualizes38
- recoverabilities27
- rectangularities24
- rectifiabilities26
- referentialities21
- reflectivenesses28
- refractivenesses27
- refractorinesses23
- refrangibilities26
- regardlessnesses21
- regeneratenesses20
- regressivenesses23
- reindustrializes29
- relentlessnesses20
- remarkablenesses28
- remorsefulnesses25
- repetitivenesses24
- repressibilities23
- repressivenesses24
- resistlessnesses18
- respectabilities26
- respectfulnesses28
- respectivenesses27
- responsibilities24
- responsivenesses25
- retrievabilities24
- revengefulnesses29
- ridiculousnesses24
- roadworthinesses23
- robustiousnesses22
- roundaboutnesses24
- salubriousnesses23
- salvageabilities27
- scandalousnesses24
- schoolmistresses25
- scrupulousnesses27
- scurrilousnesses23
- seasonablenesses22
- semisubmersibles30
- sentimentalities22
- seronegativities23
- seropositivities23
- serviceabilities27
- sesquicarbonates33
- shamefacednesses29
- slanderousnesses21
- slatternlinesses20
- sobersidednesses22
- softheadednesses24
- solicitousnesses22
- speechlessnesses26
- spiritlessnesses21
- sprightfulnesses29
- stresslessnesses18
- stretchabilities25
- strongyloidiases23
- stupendousnesses24
- subcontraoctaves31
- subjectivenesses37
- submissivenesses28
- substantialities22
- subversivenesses29
- successfulnesses29
- successivenesses28
- succinylcholines34
- sufferablenesses28
- suggestibilities25
- suggestivenesses26
- superficialities27
- superheterodynes26
- superhumannesses28
- superintendences27
- superintensities22
- supernormalities25
- supersexualities29
- supportabilities27
- supportivenesses28
- surefootednesses22
- susceptibilities27
- susceptivenesses28
- suspiciousnesses25
- sustainabilities22
- symptomatologies30
- systematicnesses25
- technostructures27
- teratogenicities22
- terminablenesses25
- territorialities17
- theocentricities25
- thermolabilities26
- thermoremanences29
- thoughtfulnesses29
- threadbarenesses23
- thriftlessnesses23
- totalitarianizes27
- trafficabilities29
- transilluminates24
- transitivenesses22
- transitorinesses18
- transmissivities24
- transsexualities26
- tremendousnesses23
- trifluoperazines34
- trinitrotoluenes20
- tumorigenicities26
- tumultuousnesses25
- turbomachineries29
- tyrannicalnesses25
- ubiquitousnesses32
- ultracentrifuges28
- ultramicroscopes30
- ultramicrotomies27
- umbrageousnesses27
- unaffectednesses29
- unalterabilities23
- unassumingnesses26
- unavailabilities27
- unavailingnesses27
- unbecomingnesses31
- unchangingnesses30
- uncongenialities26
- undecidabilities27
- undeniablenesses25
- undersecretaries22
- undesirabilities23
- uneventfulnesses29
- unexpectednesses33
- unfaithfulnesses29
- unflappabilities32
- unfriendlinesses25
- unfruitfulnesses28
- ungraciousnesses25
- ungratefulnesses26
- unmannerlinesses25
- unpalatabilities26
- unpleasantnesses24
- unpreparednesses26
- unreservednesses24
- unskillfulnesses30
- unsociablenesses26
- unthinkabilities29
- untouchabilities28
- untruthfulnesses27
- upgradeabilities27