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: aesthetic characteristic 
Words: 70, pale, fair, light, milky
70

Category: measurement unit 
Words: ounce, ear, inch, foot, milimeter
ear

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

prepare