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What word am I thinking of? Each group will give you part of what you need.
Group 1
split, peel, bunch, dump
Group 2
Vermont, Virginia, Tennessee, Kentucky, North Carolina
Group 3
Merlin, Percival, Mordred, Morgana, Oberon
Group 4
apple, wrench, water, horse, ice cream, pencil
Group 5
red, yellow...