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: bird 
Words: winch, swallow, winch, crane, parrot

SOLUTION: winch

PROBLEM: Category: corporate 
Words: solid, sustainability, streamline, firm, private

SOLUTION: solid

PROBLEM: Category: weather 
Words: windy, deal, ghostly, fair, clime

SOLUTION:
ghostly