15 letters
- redetermination21
- remanufacturers27
- rematerializing31
- rememberability30
- reregistrations18
- reservationists20
- retroperitoneal20
- reversibilities23
- revolutionizers31
- rumormongerings28
- sabermetricians25
- schlockmeisters31
- schoolmasterish26
- scintillometers24
- sclerotizations29
- semisubmersible29
- semiterrestrial19
- serendipitously24
- seroconversions24
- serviceableness27
- servomechanisms31
- silversmithings28
- sinterabilities20
- slaughterhouses24
- sledgehammering30
- snippersnappers29
- solderabilities21
- spermatogeneses24
- spermatogenesis24
- splendiferously28
- stadtholderates20
- stadtholdership25
- stereochemistry25
- stereoisomerism21
- stereologically25
- stereotaxically29
- stereotypically27
- steroidogeneses19
- steroidogenesis19
- stockbrokerages31
- subterraneously24
- superablenesses24
- superabsorbents26
- superabundances29
- superabundantly29
- superactivities26
- superannuations23
- superbureaucrat27
- supercalendered26
- superconducting31
- superconductive32
- superconductors28
- supercontinents25
- superconvenient29
- superefficiency34
- superelevations25
- superenciphered29
- supererogations22
- superfluidities25
- superfluousness26
- supergovernment30
- superheterodyne25
- superhumanities26
- superimposition26
- superindividual28
- superinductions26
- superinfections27
- superintendence26
- superintendency28
- superintendents23
- superlativeness25
- supermajorities31
- supernaturalism25
- supernaturalist22
- supernumeraries24
- supernutritions22
- superovulations26
- superparasitism25
- superpatriotism25
- superphenomenon30
- superphosphates29
- superplasticity28
- supersaturating23
- supersaturation21
- superscriptions26
- superspecialist26
- superspectacles29
- superstimulated25
- superstimulates24
- superstitiously23
- superstructural25
- superstructures24
- supersubtleties24
- supersymmetries27
- synergistically27
- tatterdemalions21
- teleconferenced28
- teleconferences27
- teletypewriters24
- temerariousness20
- temperamentally29
- temperatenesses22
- tenderheartedly23
- teratocarcinoma25
- tergiversations22
- territorialisms19
- territorialists16
- territorialized26
- territorializes25
- therapeutically28
- thermalizations31
- thermochemistry30
- thermodynamical31
- thermojunctions35
- thermoperiodism27
- thermoreceptors26
- thermoregulated25
- thermoregulates24
- thermoregulator24
- thermoremanence28
- thermostability26
- thunderstricken28
- thunderstriking27
- transferability25
- transliterating20
- transliteration18
- transmissometer22
- treacherousness22
- trifluoperazine33
- troubleshooters22
- turbogenerators22
- ultracommercial30
- ultraliberalism25
- ultramarathoner23
- ultramodernists22
- unadulteratedly24
- unalterableness23
- unanswerability27
- unceremoniously28
- uncertainnesses22
- unconcernedness27
- uncontroversial26
- underactivities25
- underemphasized36
- underemphasizes35
- underemployment31
- underestimating24
- underestimation22
- underhandedness24
- underinflations24
- underinvestment27
- undernutritions21
- underprivileged29
- underproduction27
- underpublicized39
- understandingly26
- understatements22
- undervaluations25
- unfossiliferous25
- uninterruptedly26
- universalnesses23
- unseriousnesses19
- venerablenesses25
- veraciousnesses24
- verifiabilities26
- verisimilitudes25
- veritablenesses24
- versatilenesses21
- videoconference31
- vulnerabilities26
- waterlessnesses20
- weatherboarding27
- weatherizations30
- weatherproofing29
- westernisations20
- westernizations29
- whippersnappers33
- wonderfulnesses26
- xerographically36
- xeroradiography32