10 letters
- subchapter22
- subreption18
- superbitch22
- supertonic18
- supplanter19
- suppletion19
- suppliance22
- supplicant22
- supplicate21
- supraoptic20
- tarpaulins16
- thiouracil17
- touchlines18
- trabeculas18
- trichinous17
- turophiles17
- ulceration16
- ultrabasic18
- ultrasonic16
- unactorish17
- unhappiest20
- unpastoral16
- unsociable19
- urbanistic18
- urbanities15