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: physical property 
Words: bulky, angular momentum, pasty, fat, big

SOLUTION: big

PROBLEM: Category: elements 
Words: ground, replace, combustion, flame, fire

SOLUTION: replace

PROBLEM: Category: moral characteristic 
Words: fair, make the grade, trustworthy, alright, just

SOLUTION:
make the grade