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: animal 
Words: soar, cockroach, walk, fly, run

SOLUTION: soar

PROBLEM: Category: military rank 
Words: general, fighter, normal, major, lieutenant

SOLUTION: normal

PROBLEM: Category: personal characteristic 
Words: cool, level, tropical, relaxed, classy

SOLUTION:
tropical