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: boxing terminology 
Words: canvas, tko, deck, joker, fight

SOLUTION: joker

PROBLEM: Category: outdoor sport activity 
Words: hiking, climbing, mice, fish, row

SOLUTION: mice

PROBLEM: Category: boats 
Words: deck, sail, crew, head, fold

SOLUTION:
fold