10 letters
- spectators16
- spoliators14
- sponsorial15
- sportscast16
- stainproof17
- stationers11
- statoscope16
- stenotopic17
- stipulator15
- stirabouts14
- stochastic18
- stonecrops17
- striations11
- strontiums15
- subarctics20
- substation15
- subtropics20
- succinates18
- suctorians15
- supersonic18
- supertonic18
- supinators15
- supraoptic20
- syncarpous20
- syncopator19
- syntactics19
- tonoplasts15
- tracksuits18
- traitorous11
- transcript17
- transistor11
- transports14
- transposon15
- transsonic15
- treasonous12
- tropotaxis20
- truncation16
- tutorships16
- ultrasonic16
- unactorish17
- unartistic15
- upstarting17
- uroscopies17
- urtication15
- usurpation16
- vasotocins18