16 letters
- retrievabilities24
- retroreflections24
- revisualizations32
- rhynchocephalian36
- ridiculousnesses24
- roadworthinesses23
- robustiousnesses22
- roentgenographic30
- roentgenological27
- roentgenologists23
- romanticizations33
- saccharification31
- sacrilegiousness24
- salubriousnesses23
- salvageabilities27
- satisfactoriness23
- scandalmongering31
- schoolmistresses25
- scurrilousnesses23
- sedimentological28
- sedimentologists24
- semiabstractions26
- semicolonialisms28
- semiconservative31
- semidomesticated27
- semigovernmental31
- semipermeability31
- semipornographic33
- semiprofessional27
- semiquantitative34
- semisubmersibles30
- sensationalising22
- sensationalistic22
- sensationalizing31
- sentimentalising25
- sentimentalities22
- sentimentalizing34
- septendecillions27
- seronegativities23
- seropositivities23
- serviceabilities27
- sesquicarbonates33
- sesquicentennial33
- shortsightedness24
- simplemindedness30
- simultaneousness24
- slatternlinesses20
- sobersidednesses22
- sociolinguistics27
- solicitousnesses22
- soporiferousness24
- spatiotemporally29
- spectroheliogram30
- spiritlessnesses21
- spiritualization31
- sprightfulnesses29
- stadtholderships26
- standardizations29
- stenographically31
- stereoisomerisms22
- stereomicroscope28
- stereophonically29
- stereoregularity22
- stereoscopically29
- straightforwards27
- straightjacketed37
- stretchabilities25
- stroboscopically32
- strongyloidiases23
- strongyloidiasis23
- subconsciousness29
- subjectivenesses37
- subjectivization46
- submissivenesses28
- submitochondrial31
- suboptimizations36
- suborganizations33
- subprofessionals28
- substantialities22
- substitutability27
- substitutionally26
- suburbanizations35
- subversivenesses29
- subvocalizations38
- successivenesses28
- succinylcholines34
- suggestibilities25
- suggestivenesses26
- superbillionaire26
- supercalendering29
- superciliousness26
- supercompetitive33
- supercorporation27
- superenciphering32
- superfecundation30
- superficialities27
- superheavyweight35
- superimpositions27
- superincumbently35
- superintelligent26
- superintendences27
- superintensities22
- supermillionaire26
- supernaturalisms26
- supernaturalists23
- supernormalities25
- superparasitisms26
- superpatriotisms26
- superromanticism30
- supersaturations22
- supersensitively28
- supersensitivity27
- superserviceable31
- supersexualities29
- superspecialists27
- superspecialized37
- superspeculation29
- superstimulating28
- supersubstantial26
- supplementations29
- supportabilities27
- supportivenesses28
- supposititiously27
- supranationalism26
- supranationalist23
- supranationality25
- supraventricular30
- surrealistically25
- susceptibilities27
- susceptivenesses28
- suspiciousnesses25
- sustainabilities22
- syllabifications30
- sympathectomized42
- sympathomimetics35
- symptomatologies30
- syncategorematic30
- synchronisations26
- synchronizations35
- systematicnesses25
- systematizations31
- tachyarrhythmias32
- technicalization36
- teleconferencing31
- teratocarcinomas26
- teratogenicities22
- terminablenesses25
- terminologically30
- territorialities17
- territorializing29
- theocentricities25
- thermodynamicist31
- thermolabilities26
- thermometrically31
- thermoperiodisms28
- thermoplasticity30
- thermoregulating28
- thermoregulation26
- thermostatically28
- thriftlessnesses23
- thrombocytopenia33
- thrombocytopenic36
- thromboembolisms34
- thrombophlebitis33
- thyrocalcitonins29
- thyroidectomized37
- tintinnabulation25
- totalitarianisms21
- totalitarianized28
- totalitarianizes27
- tracheobronchial31
- traditionalistic22
- traditionalizing31
- trafficabilities29
- transcontinental24
- transcriptionist24
- transfigurations24
- transformational25
- transilluminated25
- transilluminates24
- transilluminator24
- transitivenesses22
- transitorinesses18
- transliterations19
- transmissibility26
- transmissivities24
- transmissometers23
- transnationalism23
- transparentizing33
- transplantations23
- transportability26
- transportational22
- transsexualities26
- transubstantiate22
- triboelectricity28
- triboluminescent29
- trifluoperazines34
- triiodothyronine23
- trinitrotoluenes20
- triphenylmethane31