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: chocolate food 
Words: replace, fudge, cupcake, heavy, cream

SOLUTION: replace

PROBLEM: Category: boats 
Words: bridge, deck, stern, dock, suits

SOLUTION: suits

PROBLEM: Category: type of sandwich 
Words: roll, hero, burger, club, bar

SOLUTION:
bar