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: bird 
Words: neck, tackle, derrick, crane, steam roller

SOLUTION: steam roller

PROBLEM: Category: animal 
Words: fly, walk, swim, swim, fish

SOLUTION:
swim