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: emotional status 
Words: merchandise, angry, ecstatic, content, joyful

SOLUTION: merchandise

PROBLEM: Category: poker 
Words: blind, suits, fold, deck, canvas

SOLUTION: canvas

PROBLEM: Category: window material 
Words: spyhole, fiberglass, glass, knifer, metal

SOLUTION:
knifer