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: errands, fax, file, type, ram
ram

Category: geographical property 
Words: horizontal, hotel, flat, lined, smooth
hotel

Category: computers 
Words: folder, hardware, file, firewall, support

support