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: outdoor sport activity 
Words: hunt, row, wrestle, fish, hamster
hamster

Category: construction 
Words: tackle, crane, digger, sandpiper, dump truck
sandpiper

Category: chocolate food 
Words: brownies, fudge, molasses, pie, unwarranted

unwarranted