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: secretary duty 
Words: answer calls, file, correspondence, document, fax
document

Category: secretary duty 
Words: support, hardware, prepare, file, make coffee
hardware

Category: bird 
Words: davit, tackle, hoist, heron, crane

hoist