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: file, software, schedule, support, order office supplies
software

Category: emotional status 
Words: emotional, ground, ashamed, emotional upsets, down
ground

Category: aesthetic characteristic 
Words: custody, pretty, fine, exquisite, hot

custody