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: weather 
Words: brisk, ghostly, windy, fair, deal

SOLUTION: ghostly

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

SOLUTION: frustrated

PROBLEM: Category: emotional status 
Words: down, ground, ashamed, emotional supports, emotional

SOLUTION:
ground