Level 1. CLUE, UNCLE, FLUENCY, FUEL
Level 2. AGREE, EAGER, AVERAGE, GRAVE
Level 3. JUICE, JUSTICE, SUITE
Level 4. NIGHT, NINTH, NOTHING, THING
Level 5. THERE, THREE, THREW, WHETHER, WHERE
Level 6. RELATE, RELENT, ETERNAL, RENTAL
Level 7. MOVIE, PRIME, IMPROVE, PROVE
Level 8. ARIA, RAIN, TARN, TIARA, TRAIN, VARIANT, VAIN