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: organize, sort mail, fax, file, text
text

Category: poker 
Words: blind, suits, fold, deck, canvas
canvas

Category: corporate 
Words: taut, united, sustainability, concerted, firm

taut