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Level 15 - NKECTIH
The answer to this puzzle is:
Words: THICKEN, KENCH, NICHE, KITHE, TENCH, THEIN, CHINE, CHINK, KETCH, THICK, THINE, CINE, ITCH, ECHT, NITE, HICK, ETCH, CHIT, TIKE, KITH, ETIC, KHET, HENT, TINE, KENT, THIN, THEN, NICK, CITE, HECK, HINT, HIKE, NICE, TICK, CHIN, KITE, KNIT, CENT, CHI, ETC, TIN, KIT, KEN, ICE, HIE, THE, INK, NTH, KIN, TIC, NIT, TEN
Bonus words:
THICKEN, KENCH, NICHE, KITHE, TENCH, THEIN, CHINE, CHINK, KETCH, THICK, THINE, CINE, ITCH, ECHT, NITE, HICK, ETCH, CHIT, TIKE, KITH, ETIC, KHET, HENT, TINE, KENT, THIN, THEN, NICK, CITE, HECK, HINT, HIKE, NICE, TICK, CHIN, KITE, KNIT, CENT, CHI, ETC, TIN, KIT, KEN, ICE, HIE, THE, INK, NTH, KIN, TIC, NIT, TEN