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: moral characteristic 
Words: frank, stern, bun, concise, precise
Example Output: bun

Example Input: Category: poker 
Words: ring, deck, blind, cards, joker
Example Output: ring

Example Input: Category: construction 
Words: tackle, steam roller, crane, upraise, davit
Example Output:
davit