16 letters
- overorchestrates25
- overstimulations26
- paleopathologist28
- paraphrastically31
- parapsychologist32
- periphrastically31
- petrochemistries27
- phenomenologists29
- photochemistries29
- photogrammetrist29
- photojournalists33
- physiotherapists28
- phytochemistries31
- positivistically30
- postdepositional25
- postencephalitic32
- postexperimental34
- posthumousnesses27
- postindependence30
- postmillenarians26
- postpositionally27
- postpresidential25
- postresurrection24
- postsynaptically32
- preformationists26
- premillennialist27
- preposterousness24
- preregistrations22
- preservationists24
- prestidigitation23
- prestidigitators22
- procrastinations24
- prognostications26
- pseudoscientists25
- psychobiologists32
- psychohistorians29
- psychohistorical32
- psycholinguistic34
- psychophysicists36
- psychotherapists31
- quarterfinalists31
- quasicrystalline34
- questionableness32
- radiochemistries25
- reafforestations23
- redistributional23
- reestablishments26
- reindustrialized30
- reindustrializes29
- reinvestigations24
- relativistically28
- reorchestrations22
- resistlessnesses18
- resurrectionists21
- retinoblastomata24
- robustiousnesses22
- roentgenologists23
- schoolmistresses25
- sedimentologists24
- semiabstractions26
- semidomesticated27
- sensationalistic22
- sociolinguistics27
- southeasternmost23
- southwesternmost26
- stadtholderships26
- standardizations29
- stenographically31
- stereoisomerisms22
- stereomicroscope28
- stereophonically29
- stereoregularity22
- stereoscopically29
- stoutheartedness21
- straightforwards27
- straightjacketed37
- stresslessnesses18
- stretchabilities25
- stroboscopically32
- strongyloidiases23
- strongyloidiasis23
- stupendousnesses24
- substantialities22
- substitutability27
- substitutionally26
- suggestibilities25
- suggestivenesses26
- supernaturalists23
- superspecialists27
- superstimulating28
- supersubstantial26
- supranationalist23
- surrealistically25
- sustainabilities22
- systematicnesses25
- systematizations31
- technostructures27
- thermodynamicist31
- thermoplasticity30
- thermostatically28
- traditionalistic22
- transcriptionist24
- transubstantiate22
- ultranationalist21
- uncharacteristic29
- unconstitutional25
- underestimations23
- underinvestments28
- unindustrialized32
- unostentatiously23
- unrestrainedness21
- unsophistication27
- unsubstantiality26
- unsystematically30
- ununderstandable27
- upstandingnesses26
- vasoconstriction28
- vasoconstrictive31
- vasoconstrictors27