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Level 12 - SIETSSU
The answer to this puzzle is:
Words: SITUSES, TUSSIS, TUSSES, SITUS, STIES, SISES, ETUIS, SUETS, SEIS, ETUI, SUSS, TIES, USES, SETS, SUET, SITS, UTES, SUES, ITS, SIS
Bonus words:
SITUSES, TUSSIS, TUSSES, SITUS, STIES, SISES, ETUIS, SUETS, SEIS, ETUI, SUSS, TIES, USES, SETS, SUET, SITS, UTES, SUES, ITS, SIS