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: brittleness, large, fat, area, calcium

SOLUTION: calcium

PROBLEM: Category: employment activity 
Words: promote, ice, retire, ban, fire

SOLUTION: ice

PROBLEM: Category: moral characteristic 
Words: precise, grub, frank, stern, honesty

SOLUTION:
grub