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: guitar part 
Words: fret, worried, chord, notes, headstock
worried

Category: computers 
Words: hardware, download, file, support, program
support

Category: computers 
Words: space, download, support, file, format

support