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: ring, lifeline, deck, punch, corner

SOLUTION: lifeline

PROBLEM: Category: employment activity 
Words: replace, ice, fire, ban, hire

SOLUTION: ice

PROBLEM: Category: widespread 
Words: captain, standard, typical, plain, general

SOLUTION:
captain