12 letters
- spectaculars23
- spectatorial19
- spectrograms23
- spectrograph25
- spectrometer21
- spectrometry23
- spectroscope24
- spectroscopy26
- speculations21
- speechifying28
- speechlessly24
- speechwriter23
- spermathecae23
- stagecoaches22
- stapedectomy24
- steeplechase21
- stonecutters17
- stonecutting20
- stringpieces21
- subdecisions21
- subdirectors20
- subeconomies23
- subjectively35
- subjectivise32
- subjectivism35
- subjectivist32
- subjectivity34
- subjectivize41
- subsecretary21
- subspecialty25
- superinfects23
- supersecrecy24
- supersecrets19
- superspecial23
- synecologies21
- technetronic22
- technicality24
- technicalize31
- technobabble28
- technocratic24
- technologies21
- technologist21
- technologize30
- technophiles24
- technophobes26
- technophobia26
- technophobic29
- tectonically23
- telecommuted24
- telecommuter23
- telecommutes23
- thymectomies25
- thymectomize34
- trajectories24
- transections17
- transfecting22
- transfection20
- tredecillion19
- turtlenecked23
- ultraprecise20
- unaffectedly27
- unbecomingly29
- undecillions21
- undeciphered24
- undecomposed25
- undetectable22
- unecological24
- uneconomical25
- unexpectedly31
- unmechanized33
- unrecognized30
- unreconciled23
- unrecyclable27
- unreflective25
- unsuspecting24
- vasectomized32
- vasectomizes31
- venesections21
- vitrectomies22
- vivisections24
- wisecrackers25
- wisecracking28
- zeptoseconds29
- zootechnical31