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: jog, jump, fish, fly, bats
Example Output: jog

Example Input: Category: food 
Words: fortitude, meat, cheese, frank, pork
Example Output: fortitude

Example Input: Category: animals 
Words: ostrich, duck, swan, fall, dog
Example Output:
fall