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: bird 
Words: crane, pelican, egret, hummingbird, upraise
Example Output: upraise

Example Input: Category: physical activity 
Words: sprint, get down, cow, duck, bow
Example Output: cow

Example Input: Category: food 
Words: grub, entree, frank, stern, goodies
Example Output:
stern