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.

Example Input: Category: corporate 
Words: corporation, firm, alignment, taut, leverage
Example Output: taut

Example Input: Category: activity 
Words: divide, croquet, fritter, squander, spend
Example Output: croquet

Example Input: Category: animal 
Words: bee, eagle, beetle, fly, walk
Example Output:
walk