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Level 20 - RFETOIRN
The answer to this puzzle is:
Words: ROTIFER, FRONTER, REFRONT, TONIER, NORITE, RIOTER, FORINT, RETORN, IRONER, FORRIT, TRONE, OFTER, RIFER, TRINE, NITRE, FRIER, FIRER, REFIT, TRIER, NOTER, FRORE, FEINT, FINER, FETOR, IRONE, NITER, RIFE, TERN, FIRE, TORI, FRIT, FRET, ROTE, FINO, NORI, NOTE, FERN, ROTI, TORR, FROE, NITE, IRON, TIRO, FORT, FOIN, REIN, TONE, INFO, RITE, TORN, FIRN, TIER, TRIO, RIOT, INTO, FINE, NOIR, TINE, TIRE, FORE, RIFT, TORE, INRO, TOR, TON, FIT, REF, TOE, ION, ORE, NOR, NET, TIE, ONE, TIN, FOR, NOT, OFT, ROT, FEN, TEN, FER, EON, FIE, ERR, FOE, FIR, FIN, FRO, IRE, NIT, ROE
Bonus words:
ROTIFER, FRONTER, REFRONT, TONIER, NORITE, RIOTER, FORINT, RETORN, IRONER, FORRIT, TRONE, OFTER, RIFER, TRINE, NITRE, FRIER, FIRER, REFIT, TRIER, NOTER, FRORE, FEINT, FINER, FETOR, IRONE, NITER, RIFE, TERN, FIRE, TORI, FRIT, FRET, ROTE, FINO, NORI, NOTE, FERN, ROTI, TORR, FROE, NITE, IRON, TIRO, FORT, FOIN, REIN, TONE, INFO, RITE, TORN, FIRN, TIER, TRIO, RIOT, INTO, FINE, NOIR, TINE, TIRE, FORE, RIFT, TORE, INRO, TOR, TON, FIT, REF, TOE, ION, ORE, NOR, NET, TIE, ONE, TIN, FOR, NOT, OFT, ROT, FEN, TEN, FER, EON, FIE, ERR, FOE, FIR, FIN, FRO, IRE, NIT, ROE