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: window material 
Words: metal, handle, dish, glass, vinyl

SOLUTION: dish

PROBLEM: Category: guitar part 
Words: fret, worried, chord, notes, headstock

SOLUTION: worried

PROBLEM: Category: consumer product 
Words: item, shop, content, nervous, jewelry

SOLUTION:
nervous