11 letters
- semanticist18
- semiotician18
- semioticist17
- semitropics20
- solicitants16
- sonications16
- speciations18
- spiritistic17
- spirometric20
- standpoints17
- supinations17
- suspiration16
- termination16
- terminators15
- tetrasporic17
- transaction16
- transactors15
- transcripts18
- transection16
- transistors12
- transitions13
- transpiring18
- transposing18
- triceratops17
- trichinosis17
- trichromats19
- trinitarian13
- trisections15
- tristearins12
- truncations17
- unimportant20
- unpatriotic19
- urtications16
- utopianisms19
- visitations16