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: elements 
Words: fire, earth, water, blaze, recruit

SOLUTION: recruit

PROBLEM: Category: activity 
Words: fried, spend, whittle, waste, fritter

SOLUTION: fried

PROBLEM: Category: bird 
Words: hoist, tackle, ostrich, crane, pelican

SOLUTION:
hoist