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: physical property 
Words: obese, heavy, area, chunky, fat

SOLUTION: heavy

PROBLEM: Category: measurement unit 
Words: centimeter, leg, mile, meter, foot

SOLUTION: leg

PROBLEM: Category: animal 
Words: cockroach, fly, run, flutter, fish

SOLUTION:
flutter