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: type of sandwich 
Words: submarine, burger, bar, lettuce, club

SOLUTION: bar

PROBLEM: Category: aesthetic characteristic 
Words: fine, custody, level, beautiful, attractive

SOLUTION: custody

PROBLEM: Category: window material 
Words: handle, knifer, panel, glass, metal

SOLUTION:
knifer