12 letters
- psychopathic30
- psychotropic28
- pteridophyte23
- pyrophyllite26
- radioisotope16
- redevelopers21
- redeveloping24
- reoperations16
- repopularize29
- repopulating23
- repopulation21
- rhinoscopies21
- ropedancings23
- saprophagous23
- sarcoplasmic25
- saxophonists25
- schizophrene32
- scolopendras21
- scopolamines23
- semitropical22
- seropositive19
- seropurulent19
- sharecropped24
- sharecropper23
- showstoppers23
- showstopping26
- siphonophore23
- sloppinesses20
- sniperscopes22
- sociopathies20
- somatopleure20
- somatotropin19
- sophisticate20
- soporiferous19
- spanakopitas23
- spanokopitas23
- spectroscope24
- spectroscopy26
- spermophiles24
- spheroplasts21
- spokespeople26
- steatopygias19
- steatopygous20
- stereophonic21
- stereopsides16
- stereopticon19
- stereoscopes18
- stereoscopic21
- stethoscopes20
- stethoscopic23
- stroboscopes21
- stroboscopic24
- strophanthin21
- suboptimized32
- suboptimizes31
- sycophancies26
- sycophantish25
- sycophantism26
- synchroscope26
- syncopations22
- synoptically25
- technophiles24
- technophobes26
- technophobia26
- technophobic29
- teenyboppers24
- thallophytes23
- thallophytic26
- theophylline24
- theosophical23
- theosophists19
- thermophiles23
- thermophilic26
- thermoscopes23
- thermotropic23
- thixotropies24
- thyrotrophic24
- thyrotrophin22
- thyrotropins20
- topdressings19
- topicalities19
- toploftiness20
- topographers22
- topographies22
- topstitching23
- toxophilites25
- tracheophyte24
- tradespeople20
- tribespeople22
- trichopteran21
- trimethoprim23
- trochophores22
- trophallaxes26
- trophallaxis26
- trophoblasts21
- trophozoites26
- tropicalized29
- tropicalizes28
- tropological22
- tropomyosins21
- tropospheres20
- tropospheric23
- tryptophanes23
- unpopularity24
- unpropitious21
- unstoppering23
- urethroscope21
- vasopressins20
- vasopressors19
- woodchoppers27
- xanthophylls31
- xerophytisms29
- xylophonists28
- zooplankters30
- zooplanktons31
- zygapophyses35
- zygapophysis35