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: bird 
Words: winch, swift, crane, hoist, ostrich
winch

Category: moral characteristic 
Words: unprejudiced, texture, fair, impartial, well
texture

Category: physical property 
Words: skinny, fat, chunky, obese, big

big