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Level 12 - SIIPREN
The answer to this puzzle is:
Words: SPINIER, RIPENS, PINIER, REPINS, PIERS, REINS, PRIES, PRISE, REPIN, SPIER, RIPEN, PERIS, SERIN, PEINS, SPEIR, RIPES, NISEI, PIRNS, SNIP, REIS, ERNS, NISI, RINS, PERI, NIPS, REPS, RIPS, SINE, REIN, PIES, RIPE, IRIS, RISE, PIER, PINE, PENS, PINS, SIR, PIE, PER, PEN, SIN, RIP, SIP, PSI, IRE, NIP, REP, SER, RES, INS, SEN, PIN
Bonus words:
SPINIER, RIPENS, PINIER, REPINS, PIERS, REINS, PRIES, PRISE, REPIN, SPIER, RIPEN, PERIS, SERIN, PEINS, SPEIR, RIPES, NISEI, PIRNS, SNIP, REIS, ERNS, NISI, RINS, PERI, NIPS, REPS, RIPS, SINE, REIN, PIES, RIPE, IRIS, RISE, PIER, PINE, PENS, PINS, SIR, PIE, PER, PEN, SIN, RIP, SIP, PSI, IRE, NIP, REP, SER, RES, INS, SEN, PIN