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Level 15 - ECTEAHH
The answer to this puzzle is:
Words: THECAE, CHETAH, THECA, HEATH, TACHE, CHETH, TACE, EATH, ECHE, HAET, CETE, TACH, HETH, CATE, ECHT, HATH, THEE, ACT, ETC, THE, EAT, ACE, ETA, CAT, ATE, HAH
Bonus words:
THECAE, CHETAH, THECA, HEATH, TACHE, CHETH, TACE, EATH, ECHE, HAET, CETE, TACH, HETH, CATE, ECHT, HATH, THEE, ACT, ETC, THE, EAT, ACE, ETA, CAT, ATE, HAH