10 letters
- signorinas14
- singletons15
- situations12
- sonicating17
- sonnetting15
- soundstage15
- squinniest22
- stagnation14
- stannaries12
- stationing14
- stinginess14
- stonishing16
- stoutening15
- suctioning18
- suggestion16
- sunbonnets17
- supinating18
- supination16
- sustaining15
- tensioning15
- tetanising14
- tinnituses13
- toenailing15
- unassigned16
- uncanniest17
- unexciting25
- unionising16
- unitarians13
- unjointing25
- unstinting16
- untidiness14
- uraninites13
- urinations13
- wantonness16
- witnessing17