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: shady activities 
Words: falsification, wrongful, rich, fudge, unlicensed
rich

Category: food 
Words: provision, frank, hot dog, goodies, harsh
harsh

Category: secretary duty 
Words: errands, software, fax, file, correspondence

software