16 letters
- parametrizations32
- paraphrastically31
- paraprofessional27
- parapsychologies32
- parapsychologist32
- parasympathetics32
- periphrastically31
- petrographically33
- phonocardiograms31
- phonocardiograph33
- phonogrammically37
- phonographically36
- phosphoglycerate34
- photogrammetries29
- photogrammetrist29
- photographically35
- photolithographs31
- photolithography33
- photomicrographs34
- photomicrography36
- photorespiration25
- phrasemongerings30
- physiotherapists28
- phytogeographers32
- phytogeographies32
- pleasurabilities25
- plethysmographic37
- pornographically34
- practicabilities29
- praiseworthiness25
- preincorporation27
- preregistrations22
- procrastinations24
- programmatically34
- prosopographical33
- pseudepigraphies31
- psychobiographer36
- psychotherapists31
- radioautographic28
- radiochemistries25
- radiographically31
- radioimmunoassay27
- radioprotections24
- radiosensitivity24
- radiotelemetries21
- radiotelephonies24
- rambunctiousness29
- rampageousnesses26
- rationalizations28
- recentralization31
- rechoreographing31
- rechromatographs31
- rechromatography33
- reconcentrations25
- reconfigurations27
- reconsiderations22
- recoverabilities27
- refractivenesses27
- refractorinesses23
- refrangibilities26
- regeneratenesses20
- reincorporations24
- remunerativeness26
- reorchestrations22
- retransformation24
- roentgenographic30
- semiabstractions26
- semipornographic33
- spatiotemporally29
- spectroheliogram30
- stenographically31
- straightforwards27
- straightjacketed37
- subcontraoctaves31
- sufferablenesses28
- superbureaucrats28
- supercorporation27
- supernaturalisms26
- supernaturalists23
- supernaturalness24
- superparasitisms26
- supersaturations22
- supranationalism26
- supranationalist23
- supranationality25
- supraventricular30
- teratocarcinomas26
- teratogenicities22
- tetrahydrofurans26
- tetramethylleads26
- tracheobronchial31
- traditionalistic22
- traditionalizing31
- trafficabilities29
- transcendentally27
- transcontinental24
- transcriptionist24
- transfigurations24
- transformational25
- transilluminated25
- transilluminates24
- transilluminator24
- transitivenesses22
- transitorinesses18
- transliterations19
- transmissibility26
- transmissivities24
- transmissometers23
- transnationalism23
- transparentizing33
- transplacentally29
- transplantations23
- transportability26
- transportational22
- transsexualities26
- transubstantiate22
- trifluoperazines34
- tyrannicalnesses25
- ultracentrifugal29
- ultracentrifuged29
- ultracentrifuges28
- ultrafiltrations23
- ultraliberalisms26
- ultralightweight30
- ultramarathoners24
- ultramicroscopes30
- ultramicroscopic33
- ultramicrotomies27
- ultranationalism24
- ultranationalist21
- ultraparadoxical33
- ultraprogressive27
- ultrarespectable28
- ultrasonographer26
- ultrasonographic29
- umbrageousnesses27
- unalterabilities23
- unattractiveness26
- uncharacteristic29
- undemocratically32
- underachievement32
- underappreciated29
- undesirabilities23
- ungraciousnesses25
- ungrammaticality32
- ungratefulnesses26
- unrestrainedness21
- upgradeabilities27
- vulnerablenesses28
- weatherabilities25