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: aesthetic characteristic 
Words: variety, fair, alright, pale, flaxen
Example Output: alright

Example Input: Category: ocean 
Words: current, wave, whirlpool, sea, data sets
Example Output: data sets

Example Input: Category: window material 
Words: spatula, panel, plastic, glass, translucent fabric
Example Output:
spatula