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

SOLUTION: horse

PROBLEM: Category: type of rigidity 
Words: inflexible, tough, taut, firm, leverage

SOLUTION: leverage

PROBLEM: Category: direction 
Words: backward, loveful, sliding, down, left

SOLUTION:
loveful