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: animal 
Words: hamster, mice, fish, tiger, row
Example Output: row

Example Input: Category: baby animals 
Words: follow, colt, fawn, cub, calf
Example Output: follow

Example Input: Category: ocean 
Words: flow, sea, moon, current, do tests
Example Output:
do tests