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: hike, cow, trap, row, fish

SOLUTION: cow

PROBLEM: Category: shady activities 
Words: falsehood, banned, heavy, unlicensed, fudge

SOLUTION: heavy

PROBLEM: Category: animals 
Words: ostrich, sheep, duck, horse, swim

SOLUTION:
swim