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: animal 
Words: fish, bat, sea turtle, trap, goat

Answer: trap


Question: Category: temperature 
Words: cold, cool, icy, assured, mild

Answer: assured


Question: Category: bird 
Words: crane, neck, excavator, tackle, egret

Answer:
excavator