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: emotional status 
Words: board, bored, emotional supports, frustrated, fret
board

Category: boats 
Words: deck, call, galley, bridge, stern
call

Category: secretary duty 
Words: space, organize, file, prepare, schedule

space