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, notes, emotional upsets, output cord, truss rod

SOLUTION: emotional upsets

PROBLEM: Category: aesthetic characteristic 
Words: there, ticket, fine, dull, level

SOLUTION: ticket

PROBLEM: Category: poker 
Words: deck, dock, joker, suits, hearts

SOLUTION:
dock