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: elements 
Words: fire, earth, water, blaze, recruit
recruit

Category: computers 
Words: download, file, order office supplies, document, motherboard
order office supplies

Category: shady activities 
Words: fudge, fib, unlicensed, rich, unwarranted

rich