TASK DEFINITION: Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
PROBLEM: ounce, foot, kilometer, milimeter, heel

SOLUTION: heel

PROBLEM: truss rod, pick, chord, worried, fret

SOLUTION: worried

PROBLEM: 70, fair, color, stormy, tangle

SOLUTION:
color