13 letters
- quarterstaves27
- quasicrystals29
- quotabilities27
- razzamatazzes52
- reattachments22
- recapitalized30
- recapitalizes29
- recomputation24
- recontaminate21
- recrystallize29
- rectangularly24
- reestablished20
- reestablishes19
- reexportation24
- reforestation17
- regimentation20
- regurgitating21
- regurgitation19
- rehabilitants20
- rehabilitated20
- rehabilitates19
- rehabilitator19
- rehospitalize28
- reimportation20
- reinfestation18
- reinstatement18
- remilitarized27
- remilitarizes26
- rentabilities18
- reorientating17
- reorientation15
- repeatability22
- replantations19
- representable21
- resectability22
- restabilizing29
- restauranteur16
- restaurateurs15
- resuscitating20
- resuscitation18
- resuscitative21
- resuscitators17
- revegetations20
- rhodomontades21
- rudimentarily22
- sacerdotalism21
- sacerdotalist18
- sacramentally24
- salutatorians16
- sclerodermata21
- secobarbitals23
- secretagogues21
- secretaryship23
- sectarianisms20
- sectarianized27
- sectarianizes26
- sedimentation19
- segmentations20
- semisedentary20
- sentimentally22
- sexploitation25
- solicitations18
- somatostatins17
- spectacularly27
- spectatorship24
- spontaneities18
- spontaneously22
- stabilization27
- stablishments23
- staggerbushes23
- standardbreds20
- standardising19
- standardizing28
- standoffishly26
- standpattisms21
- staphylococci30
- starchinesses19
- statelessness15
- statelinesses15
- statesmanlike22
- statesmanship22
- stationmaster17
- statistically20
- statisticians17
- staunchnesses21
- sternutations16
- straightaways22
- subdebutantes23
- substanceless22
- substantially22
- substantiated19
- substantiates18
- substantively25
- substantivize31
- substitutable22
- suitabilities18
- superfetation21
- supermilitant22
- superstardoms21
- superstations18
- supplantation23
- supplementals26
- supplementary27
- sustentations16
- symmetallisms26
- syntactically26
- tablespoonful26
- tachistoscope24
- taciturnities18
- tactfulnesses22
- talkativeness23
- tangibilities20
- tantalizingly30
- tastelessness15
- tautologously21
- taxonomically31
- teleportation18
- temperamental24
- tentativeness19
- testabilities17
- tetanizations24
- tetartohedral17
- thermostating21
- thermostatted19
- totalitarians15
- tractableness21
- transcriptase20
- transductants20
- transmittable21
- transmittance21
- transmountain20
- transmutation19
- transmutative22
- transportable21
- trisoctahedra19
- ultradistance20
- ultramilitant20
- ultramontanes20
- unaccountable27
- unaccountably29
- uncapitalized32
- uncertainness20
- uncertainties19
- uncomfortable28
- uncomfortably30
- uncontainable24
- uncorrectable25
- understaffing25
- understanding21
- understatedly20
- unestablished22
- unforgettable24
- unforgettably26
- unimportances25
- uninhabitable25
- uniparentally23
- unitarianisms19
- unmetabolized32
- unpredictable26
- unpredictably28
- unrepentantly23
- unrespectable25
- unsentimental21
- unspectacular26
- unsubstantial21
- unsuitability22
- unsupportable26
- unsustainable21
- unwarrantable23
- unwarrantably25
- vegetarianism23
- veritableness22
- vitalizations28
- voluntariness21
- voluntaristic23
- voluntaryisms25
- voluntaryists22
- wettabilities20