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: food 
Words: fortitude, meat, cheese, frank, pork

SOLUTION: fortitude

PROBLEM: Category: corporate 
Words: corporation, firm, synergy, tough, concerted

SOLUTION: tough

PROBLEM: Category: physical activity 
Words: fall, roll, tumble, cold, stoop

SOLUTION:
cold