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Level 6 - HRAETT
The answer to this puzzle is:
Words: HATTER, HATER, THETA, RATHE, TETRA, TATER, TEAT, TATE, EATH, RATH, HAET, HART, RHEA, TARE, ARE, THE, TAR, TAT, ATE, RAH, HER, ETA, ATT, RAT
Bonus words:
HATTER, HATER, THETA, RATHE, TETRA, TATER, TEAT, TATE, EATH, RATH, HAET, HART, RHEA, TARE, ARE, THE, TAR, TAT, ATE, RAH, HER, ETA, ATT, RAT