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: physical property 
Words: fat, area, ugly, capacitance, calcium
calcium

Category: military rank 
Words: regular, major, general, soldier, cadet
regular

Category: secretary duty 
Words: organize, file, make coffee, image, correspondence

image