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: computers 
Words: folder, text, file, ram, prepare
prepare

Category: weather 
Words: tangle, ghostly, fair, raining, sunny
ghostly

Category: moral characteristic 
Words: 70, just, impartial, unprejudiced, fair

70