15 letters
- irrefragability26
- kaffeeklatsches35
- latensification24
- lightfastnesses24
- lignosulfonates25
- masterfulnesses24
- materfamiliases25
- mellifluousness27
- metafictionists25
- methoxyfluranes35
- misinformations26
- mistrustfulness25
- modifiabilities26
- monospecificity33
- multifunctional30
- neurofibrillary27
- neuroscientific27
- noncertificated27
- nonconfidential27
- nonconformances31
- nonconformities27
- nonenforcements28
- nonflammability33
- nonfulfillments31
- noninflammatory30
- noninflationary25
- noninflectional27
- noninformations25
- noninterference25
- nonperformances30
- nonpreferential25
- nonprofessional25
- nonprofessorial24
- nonquantifiable35
- nonsaponifiable28
- nonspecifically33
- nontransferable25
- nonuniformities25
- objectification37
- odoriferousness21
- offensivenesses27
- offhandednesses27
- officiousnesses26
- overclassifying31
- overconfidences31
- overconfidently31
- overdiversified28
- overfamiliarity28
- overfertilizing35
- overidentifying29
- overrefinements27
- oversimplifying34
- perfectionistic28
- perfunctoriness27
- personification26
- pestiferousness23
- photofinishings29
- phytoflagellate30
- plentifulnesses26
- posttransfusion24
- prayerfulnesses26
- prefabrications28
- preferabilities25
- prefiguratively31
- preformationist25
- premanufactured31
- premanufactures30
- premodification29
- prenotification26
- preperformances31
- preprofessional26
- prettifications25
- professionalism26
- professionalize32
- profitabilities25
- quantifications33
- quarterfinalist30
- reafforestation22
- recertification25
- recodifications26
- reconfiguration26
- reconfirmations26
- reflectometries25
- reflexivenesses31
- reformabilities25
- refortification25
- refractometries24
- refrangibleness26
- refundabilities25
- regardfulnesses24
- regretfulnesses23
- remanufacturers27
- remanufacturing30
- reposefulnesses24
- reproachfulness29
- requalification33
- resentfulnesses22
- resourcefulness25
- retroreflection23
- retroreflective26
- retroreflectors22
- revivifications30
- rigidifications25
- sanctifications26
- saponifications26
- shiftlessnesses22
- silicifications26
- simplifications29
- softheartedness22
- solidifications24
- sorrowfulnesses24
- splendiferously28
- standoffishness26
- steadfastnesses20
- straightforward26
- stratifications22
- stultifications24
- subinfeudations26
- subprofessional27
- sulfinpyrazones36
- sulfurousnesses23
- superefficiency34
- superfluidities25
- superfluousness26
- superinfections27
- suspensefulness26
- syllabification29
- teleconferenced28
- teleconferences27
- tetrahydrofuran25
- tightfistedness24
- transferability25
- transfiguration23
- transformations23
- transmogrifying29
- trifluoperazine33
- ultracentrifuge27
- ultrafastidious22
- ultrafiltration22
- underinflations24
- undutifulnesses25
- unfamiliarities24
- unfavorableness29
- unfeelingnesses25
- unforgivingness30
- unfossiliferous25
- uniformitarians24
- uninformatively31
- unprofessionals25
- unselfishnesses24
- verifiabilities26
- videoconference31
- weatherproofing29
- wonderfulnesses26