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Level 13 - EEVPWIR
The answer to this puzzle is:
Words: VIPER, REIVE, WIPER, WIVER, VEEP, EWER, VIER, PERV, RIVE, WEIR, PERE, PERI, WEER, WERE, VEER, WIPE, RIPE, PIER, WEEP, PEW, VEE, VIE, ERE, IRE, WEE, REP, REV, PEE, EWE
Bonus words:
VIPER, REIVE, WIPER, WIVER, VEEP, EWER, VIER, PERV, RIVE, WEIR, PERE, PERI, WEER, WERE, VEER, WIPE, RIPE, PIER, WEEP, PEW, VEE, VIE, ERE, IRE, WEE, REP, REV, PEE, EWE