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: mode of transportation 
Words: bus, fly, jog, beetle, drive
Example Output: beetle

Example Input: Category: emotional status 
Words: well, detached, fine, wispy, relaxed
Example Output: wispy

Example Input: Category: emotional status 
Words: emotionalities, remorseful, emotional upsets, down, below
Example Output:
below