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: boats 
Words: lifeline, stern, fold, deck, rudder
Example Output: fold

Example Input: Category: date status 
Words: early, current, tide, up to the moment, do tests
Example Output: tide

Example Input: Category: bird 
Words: digger, derrick, egret, crane, hoist
Example Output:
digger