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.
--------
Question: Category: bird 
Words: hummingbird, tackle, crane, hoist, tackle

Answer: tackle


Question: Category: emotional status 
Words: ashamed, down, emotional upsets, disgusted, ground

Answer: ground


Question: Category: activity 
Words: cake, waste away, fritter, squander, whittle

Answer:
cake