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Level 19 - IVRSIOST
The answer to this puzzle is:
Words: VIROSIS, TSORIS, VISORS, TRIOS, TORII, TROIS, TORSI, TIROS, ROTIS, STIRS, RIOTS, SITS, TRIO, IRIS, TIRO, ROTI, TORI, TORS, SIRS, ROTS, ITS, SIS, TOR, SOT
Bonus words:
VIROSIS, TSORIS, VISORS, TRIOS, TORII, TROIS, TORSI, TIROS, ROTIS, STIRS, RIOTS, SITS, TRIO, IRIS, TIRO, ROTI, TORI, TORS, SIRS, ROTS, ITS, SIS, TOR, SOT