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: bird 
Words: swift, tackle, pelican, crane, hoist

SOLUTION: hoist

PROBLEM: Category: direction 
Words: remorseful, south, descending, downward, down

SOLUTION: remorseful

PROBLEM: Category: employment activity 
Words: let go, fire, recruit, promote, earth

SOLUTION:
earth