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: weather 
Words: tangle, ghostly, fair, raining, sunny

SOLUTION: ghostly

PROBLEM: Category: ocean 
Words: current, wave, whirlpool, sea, data sets

SOLUTION: data sets

PROBLEM: Category: employment activity 
Words: air, let go, pay, fire, remove

SOLUTION:
air