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

SOLUTION: concerned

PROBLEM: Category: guitar part 
Words: frustrated, amp, string, fret, headstock

SOLUTION: frustrated

PROBLEM: Category: police punishment 
Words: arrest, classy, penalty, wispy, fine

SOLUTION:
classy