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: crane, pelican, egret, hummingbird, upraise
upraise

Category: poker 
Words: fold, blind, deck, draw, box
box

Category: physical activity 
Words: push, stoop, duck, squat, ostrich

ostrich