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: ostrich, digger, sandpiper, crane, goose
digger

Category: activity 
Words: divide, fritter, dessert, whittle, spend
dessert

Category: construction 
Words: heron, crane, upraise, hoist, davit

heron