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: physical property 
Words: fat, vitamin c, area, brittleness, absorption
Example Output: vitamin c

Example Input: Category: computers 
Words: download, file, order office supplies, document, motherboard
Example Output: order office supplies

Example Input: Category: window material 
Words: translucent fabric, fiberglass, spoon, glass, vinyl
Example Output:
spoon