14 letters
- restauranteurs17
- retractilities18
- retransferring21
- retransforming24
- retranslations17
- retransmission19
- retransmitting21
- retrogradation18
- reverberations22
- roentgenograms23
- sacramentalism25
- sacramentalist22
- scatterbrained22
- scintigraphies25
- scratchinesses23
- seismographers24
- seismographies24
- separabilities21
- separatenesses18
- separationists18
- sequestrations25
- severabilities22
- shadowgraphies27
- spatiotemporal24
- spectrographic30
- sporangiophore25
- stadtholderate19
- stereographies21
- stereographing24
- stockbrokerage30
- straightjacket34
- straightnesses19
- straitjacketed31
- strandednesses18
- strangulations20
- stratification21
- stratigraphies21
- stratovolcanos23
- structuralisms23
- structuralists20
- structuralized30
- structuralizes29
- structurations20
- subarachnoidal26
- subcontracting28
- subcontractors25
- subgenerations22
- subliteratures20
- subsaturations20
- subterraneanly23
- subtherapeutic27
- sufferableness26
- sulfinpyrazone35
- superabounding27
- superabsorbent25
- superabundance28
- superachievers27
- superadditions21
- superambitious25
- superannuating24
- superannuation22
- supergravities24
- supernaturally24
- supersaturated20
- supersaturates19
- supramolecular27
- suprasegmental25
- teratogenicity22
- tetrachlorides21
- tetrafluorides20
- tetragrammaton23
- theocratically26
- thermographies26
- thoroughbraces27
- tolerabilities19
- traceabilities21
- tracheostomies22
- tractabilities21
- traditionalism20
- traditionalist17
- traditionalize26
- trafficability29
- trainabilities19
- tranquillities27
- tranquillizers36
- tranquillizing39
- tranquilnesses27
- transamination20
- transcendences24
- transcendental22
- transcendently24
- transcriptases21
- transcriptions22
- transcutaneous21
- transductional22
- transferential20
- transformation22
- transformative25
- transgressions18
- transistorised16
- transistorises15
- transistorized25
- transistorizes24
- transitionally20
- transitiveness20
- transitivities19
- transitoriness16
- transliterated17
- transliterates16
- translocations20
- translucencies24
- transmigrating23
- transmigration21
- transmigrators20
- transmigratory22
- transmissivity24
- transmittances22
- transmogrified24
- transmogrifies23
- transmutations20
- transparencies22
- transparentize28
- transpirations19
- transplacental24
- transplantable24
- transportation19
- transpositions19
- transsexualism27
- transsexuality26
- transshipments24
- transvaluating24
- transvaluation22
- trapezohedrons30
- traumatization28
- triliteralisms19
- turbogenerator21
- tyrannicalness23
- ultracivilized34
- ultracompetent26
- ultradistances21
- ultraefficient26
- ultraenergetic22
- ultraexclusive32
- ultrafiltrates20
- ultraglamorous23
- ultrahazardous29
- ultramarathons22
- ultramasculine25
- ultramicrotome25
- ultramicrotomy27
- ultraminiature21
- ultramodernist21
- ultramontanism24
- ultrapatriotic22
- ultrapractical26
- ultraprecision23
- ultrarealistic20
- ultrarightists20
- ultraroyalists19
- ultrasensitive21
- ultrasonically24
- ultrastructure21
- ultraviolences25
- umbrageousness25
- unacculturated26
- unalterability23
- unattractively26
- unbureaucratic27
- uncontemporary28
- uncontradicted25
- uncorroborated23
- undecipherable29
- underachievers26
- underachieving29
- undergraduates21
- undersaturated19
- understrappers23
- undesirability23
- undiscoverable28
- undramatically27
- ungraciousness23
- ungratefulness24
- unincorporated24
- uningratiating22
- unprogrammable31
- unrefrigerated22
- unregenerately22
- unrestrainedly21
- untranslatable22
- upgradeability27
- venerabilities23
- verbigerations24
- viticulturally28
- vituperatively29
- vulnerableness26
- weatherability25
- wrathfulnesses25
- zoogeographers32
- zoogeographies32