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: goat, cat, fish, hamster, hunting

SOLUTION: hunting

PROBLEM: Category: employment activity 
Words: recruit, replace, sack, heat, fire

SOLUTION: heat

PROBLEM: Category: date status 
Words: delayed, current, whirlpool, do tests, up to the moment

SOLUTION:
whirlpool