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Level 13 - DTUOINC
The answer to this puzzle is:
Words: NOCTUID, INDUCT, DICOT, COUNT, CUTIN, TONDI, ONTIC, DUCT, DOIT, UDON, OTIC, DINT, CUNT, DUIT, CONI, UNTO, CION, UNCO, DUNT, DUCI, INTO, DINO, UNIT, COIN, ICON, UNDO, NOD, CUT, NUT, DON, COD, COT, DOC, CON, DOT, DUO, DUN, DIN, ION, CUD, DIT, OUD, NIT, TUN, TIC, TIN
Bonus words:
NOCTUID, INDUCT, DICOT, COUNT, CUTIN, TONDI, ONTIC, DUCT, DOIT, UDON, OTIC, DINT, CUNT, DUIT, CONI, UNTO, CION, UNCO, DUNT, DUCI, INTO, DINO, UNIT, COIN, ICON, UNDO, NOD, CUT, NUT, DON, COD, COT, DOC, CON, DOT, DUO, DUN, DIN, ION, CUD, DIT, OUD, NIT, TUN, TIC, TIN