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

SOLUTION: heel

PROBLEM: Category: emotional status 
Words: worried, angry, jack, fret, emotional upsets

SOLUTION: jack

PROBLEM: Category: weather 
Words: fair, tangle, level, deal, make the grade

SOLUTION:
level