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: animal 
Words: goat, stingray, tiger, hike, fish

SOLUTION: hike

PROBLEM: Category: location (proximity) 
Words: near, close, gated, bordering, on top of

SOLUTION: gated

PROBLEM: Category: window material 
Words: spyhole, knife, plastic, glass, metal

SOLUTION:
knife