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: police punishment 
Words: ticket, comfortable, prime, custody, fine

SOLUTION: comfortable

PROBLEM: Category: guitar part 
Words: fret, concerned, jack, notes, amp

SOLUTION: concerned

PROBLEM: Category: animals 
Words: mallet, goose, geese, hike, duck

SOLUTION:
hike