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: weather 
Words: cold, 70, fair, well, luke
Example Output: well

Example Input: Category: activity 
Words: dally, seperate, fritter, waste, fried
Example Output: fried

Example Input: Category: construction 
Words: windlass, crane, dump truck, pelican, digger
Example Output:
pelican