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: baby animals 
Words: lust, kitten, deer, bambi, fawn
Example Output: lust

Example Input: Category: bird 
Words: digger, heron, crane, mallet, sandpiper
Example Output: digger

Example Input: Category: moral characteristic 
Words: balanced, loyal, pale, fair, decent
Example Output:
pale