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: employment activity 
Words: sack, inferno, promote, empower, fire

SOLUTION: inferno

PROBLEM: Category: direction 
Words: down, opposite of up, sliding, forward, emotional state

SOLUTION: emotional state

PROBLEM: Category: bird 
Words: crane, dump truck, ostrich, heron, tackle

SOLUTION:
dump truck