16 letters
- photoionizations32
- photomultipliers30
- photoproductions30
- photorespiration25
- photosensitivity28
- photosensitizers31
- photosensitizing34
- phototypesetting29
- phylogenetically34
- pictorialization33
- platitudinarians24
- pleasurabilities25
- polarizabilities33
- politicalization34
- polycondensation29
- polydispersities26
- polyphyletically37
- polysynaptically35
- positivistically30
- postdepositional25
- postencephalitic32
- postindependence30
- postpositionally27
- postpresidential25
- postresurrection24
- postsynaptically32
- practicabilities29
- precancellations29
- precertification29
- predetermination25
- predictabilities27
- preformationists26
- preincorporation27
- premodifications30
- prenotifications27
- prequalification37
- preregistrations22
- prerevolutionary28
- presentabilities24
- preservabilities27
- preservationists24
- prestidigitation23
- prestidigitators22
- presuppositional28
- preventabilities28
- preventivenesses29
- processabilities26
- processibilities26
- procrastinations24
- productivenesses29
- prognostications26
- programmatically34
- prophylactically37
- propitiousnesses24
- proselytizations32
- protectivenesses27
- prussianizations31
- pseudoscientific31
- pseudoscientists25
- psychoanalytical34
- psycholinguistic34
- psychotomimetics35
- pyelonephritides29
- quadruplications36
- quantificational35
- quantitativeness32
- questionableness32
- quintessentially32
- radioprotections24
- radiosensitivity24
- rambunctiousness29
- rationalizations28
- reaccreditations24
- reafforestations23
- reapportionments27
- reauthorizations29
- recapitalization33
- recentralization31
- recertifications26
- reclassification27
- reconcentrations25
- reconfigurations27
- reconsiderations22
- recontaminations25
- recoverabilities27
- rectangularities24
- rectifiabilities26
- redeterminations22
- redistributional23
- referentialities21
- reflectivenesses28
- refortifications26
- refractivenesses27
- refrangibilities26
- regionalizations30
- reincorporations24
- reinterpretation21
- reinvestigations24
- relativistically28
- remilitarization30
- remunerativeness26
- renormalizations31
- reorchestrations22
- reorganizational30
- repetitivenesses24
- representational22
- representatively27
- representativity26
- repressibilities23
- reprivatizations33
- requalifications34
- resocializations30
- resolidification25
- respectabilities26
- respectivenesses27
- responsibilities24
- resurrectionists21
- retinoblastomata24
- retransformation24
- retrievabilities24
- retroreflections24
- revisualizations32
- robustiousnesses22
- romanticizations33
- saccharification31
- salvageabilities27
- satisfactoriness23
- semiabstractions26
- semiconservative31
- semidomesticated27
- semiquantitative34
- sensationalising22
- sensationalistic22
- sensationalizing31
- sentimentalising25
- sentimentalities22
- sentimentalizing34
- seronegativities23
- seropositivities23
- serviceabilities27
- sociolinguistics27
- spatiotemporally29
- spiritualization31
- standardizations29
- stretchabilities25
- subjectivenesses37
- subjectivization46
- suboptimizations36
- suborganizations33
- substantialities22
- substitutability27
- substitutionally26
- suburbanizations35
- subvocalizations38
- suggestibilities25
- suggestivenesses26
- supercompetitive33
- supercorporation27
- superfecundation30
- superficialities27
- superimpositions27
- superintensities22
- supernormalities25
- superparasitisms26
- superpatriotisms26
- superromanticism30
- supersaturations22
- supersensitively28
- supersensitivity27
- supersexualities29
- superspeculation29
- superstimulating28
- supersubstantial26
- supplementations29
- supportabilities27
- supportivenesses28
- supposititiously27
- supranationalism26
- supranationalist23
- supranationality25
- surrealistically25
- susceptibilities27
- susceptivenesses28
- sustainabilities22
- syllabifications30
- sympathomimetics35
- syncategorematic30
- synchronisations26
- synchronizations35
- systematicnesses25
- systematizations31
- technicalization36
- teratogenicities22
- territorialities17
- theocentricities25
- thermolabilities26
- thermoplasticity30
- thermoregulating28
- thermoregulation26
- thermostatically28