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: pay, instruct, heat, fire, scold

SOLUTION: heat

PROBLEM: Category: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse

SOLUTION: horse

PROBLEM: Category: aesthetic characteristic 
Words: well, size, well, light, fair

SOLUTION:
well