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: food 
Words: provision, frank, hot dog, goodies, harsh
Example Output: harsh

Example Input: Category: body part 
Words: heel, shin, pound, finger, foot
Example Output: pound

Example Input: Category: emotional status 
Words: activity, fearful, sad, jealous, content
Example Output:
activity