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: corporate 
Words: corporation, firm, synergy, tough, concerted
tough

Category: computers 
Words: errands, file, download, text, folder
errands

Category: aesthetic characteristic 
Words: decent, flaxen, level, cool, fair

decent