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: outdoor sport activity 
Words: dog, swim, hike, hiking, fish

SOLUTION: dog

PROBLEM: Category: type of sandwich 
Words: submarine, group, club, roll, grilled cheese

SOLUTION: group

PROBLEM: Category: employment activity 
Words: heat, fire, empower, hire, replace

SOLUTION:
heat