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: weather 
Words: stormy, make the grade, sunny, texture, fair
Example Output: texture

Example Input: Category: animal 
Words: fly, swim, car, beetle, grasshopper
Example Output:
car