🟨 Yellow — Easiest
INSTRUCT
COACH, DIRECT, GUIDE, TRAIN
🟩 Green
MEANS
INSTRUMENT, MEDIUM, ORGAN, VEHICLE
🟦 Blue
STARTING WITH GREEK NUMERICAL PREFIXES
DIOXIDE, MONORAIL, TETRACYCLINE, TRIANGLE
🟪 Purple — Hardest
ANAGRAMS OF MUSICAL INSTRUMENTS
ABUT, BULGE, GROAN, VOILA