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: boats 
Words: check, stern, hull, galley, deck

SOLUTION: check

PROBLEM: Category: physical property 
Words: brittleness, protein, bulky, skinny, fat

SOLUTION: protein

PROBLEM: Category: corporate 
Words: sustainability, alignment, unyielding, firm, leverage

SOLUTION:
unyielding