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: emotional display 
Words: fawn, antling, lust, suppressed, love
Example Output: antling

Example Input: Category: military rank 
Words: general, fighter, normal, major, lieutenant
Example Output: normal

Example Input: Category: guitar part 
Words: fret, sad, amp, fingerpick, string
Example Output:
sad