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.

Category: secretary duty 
Words: answer calls, file, correspondence, document, fax
document

Category: boxing terminology 
Words: deck, gunwale, level, tko, jab
gunwale

Category: moral characteristic 
Words: pale, ok, fair, decent, balanced

pale