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Level 19 - UENNRRS
The answer to this puzzle is:
Words: NURSER, RERUNS, SURER, RUERS, RUNES, RUSE, RUES, URNS, ERRS, RUNS, ERNS, NUNS, ERR, RUE, RES, SEN, SER, RUN
Bonus words:
NURSER, RERUNS, SURER, RUERS, RUNES, RUSE, RUES, URNS, ERRS, RUNS, ERNS, NUNS, ERR, RUE, RES, SEN, SER, RUN